This is a feast discussed in both the Tanak (Torah/Prophets/Writings) and the Brit Chadashah (Renewed Covenant). It truly is the feast where men cannot know the day or hour (in case it is not spotted in the sky from Jerusalem). Here are the Scriptures to testify to this feast:
"Speak to the children of Yisrael, saying, 'In the seventh month, on the first day of the month, you have a rest, a remembrance of blowing of trumpets, a set-apart gathering. You do no servile work, and you shall bring an offering made by fire to YHVH." Vayiqra (Leviticus) 23:24-25 (ISR98)
This feast is connected to Rosh Chodesh (the "head of the month"), so the moon must be starting to make its appearance and its renewal. I have heard refutation of the Torah being done away with, but knowing the Torah unlocks revelation into the Gospels of Matthew (Chapter 24) and Mark:
"But concerning that day and the hour no one knows, not even the messengers in heaven, nor the Son, but only the Father. Take heed, watch and pray, for you do not know when the time is-as a man going abroad, having left his house and given authority to his servants, and to each his work, and commanded the doorkeeper to watch. Watch therefore, for you do not know when the master of the house is coming-in the evening or at midnight, or at the crowing of the cock, or in the morning, lest, coming suddenly, he should find you sleeping. And what I say to you, I say to all: Watch!" Mark 13:32-37
Also, Yeshua talks about the parable of the ten virgins:
"And at midnight a cry was heard, 'See, the bridegroom is coming, go out to meet him! Then all those maidens rose up and trimmed their lamps. And the foolish said to the wise, 'Give us of your oil, because our lamps are going out.' But the wise answered, saying, 'No, indeed, there would not be enough for us and you. Instead, go to those who sell, and buy for yourselves.' And while they went to buy, the bridegroom came, and those who were ready went in with him to the wedding feast, and the door was shut. And later the other maidens also came, saying, 'Master, Master open up for us!' But he answering, said, 'Truly, I say to you, I do not know you. Watch therefore, because you do not know the day or the hour in which the Son of Adam is coming." Matthew 25: 1-13
But remember, when Yeshua DOES come (HalleluYah!), the Gospel of Matthew reveals:
"And immediately after the distress of those days the sun shall be darkened, and the moon shall not give its light, and the stars shall fall from the heaven, and the powers of the heavens shall be shaken. Then the sign of the Son of Adam shall appear in heaven, and then all the tribes of the earth shall mourn, and they shall see the Son of Adam coming on the clouds of the heaven with power and much esteem. And He shall send His messengers with a great sound of a trumpet, and they shall gather together His chosen ones from the four winds, from one end of the heavens to the other." Matthew 24: 29-31
Now I point out the similarities, based on these Scriptures, for the Feast and Messiah's return:
1. Both emphatically are unknown the day or hour.
2. Both give serious signs from the heavens to indicate the time is near.
3. Both connect the mitzvah of blowing a trumpet.
4. Both emphasize the need to watch and stand guard of the approaching time.
So hide these truths in your treasury because they will leave us wise to the coming of Mashiach (Messiah).
I have had people throw 1Thessalonians 5 at me to argue that every day is the same and that the Scriptures stress the idea we are to be unknowing (aka ignorant) of Mashiach's return. However, if one reads those verses in context and totality, you will glean a very different understanding:
"Now, brothers, as to the times and the seasons, you do not need to be written to. For you yourselves know very well that the day of YHVH comes as a thief in the night. For when they say, 'Peace and safety!' then suddenly destruction comes upon them, as labour pains upon a pregnant woman, and they shall not escape." 1 Thessalonians 5:1-3
Now keep reading...
"But you, brothers, are not in darkness, so that the Day should overtake you as a thief. For you are all sons of light and sons of the day. We are not of the night nor of darkness. So then, we should not sleep, as others do, but we should watch and be sober. For those who sleep, sleep at night, and those who get drunk are drunk at night. But we who are of the day should be sober, putting on the breastplate of belief and love, and as a helmet the expectation of deliverance. Because Elohim did not appoint us to wrath, but to obtain deliverance through our Master Yeshua Messiah, who died for us, so that we, whether awake or asleep, should live together with Him." 1 Thessalonians 5: 4-10
Sha'ul (Paul) further encourages us in ways to prepare ourselves for Yeshua Messiah's coming:
"Therefore encourage one another, and build up one another, as indeed you do. But brothers, we beg you to know those who labour among you, and are over you in the Master and admonish you, and to hold them in the highest regard in love because of their work. Be at peace among yourselves. And we appeal to you, brothers, warn those who are disorderly, encourage the faint-hearted, uphold the weak, be patient with all. See that no one renders evil for evil to anyone, but always pursue what is good both for yourselves and for all. Rejoice always, pray without ceasing, in all circumstances give thanks, for this is the desire of Elohim in Messiah Yeshua for you. Do not quench the Spirit. Do not despise prophecies, prove them all. Hold fast what is good. Keep back from every form of wickedness. And Elohim of peace Himself set you completely apart, and your entire spirit, and being, and body-be preserved blameless at the coming of our Master Yeshua Messiah! He who calls you is trustworthy, who also shall do it. Brothers, pray for us. Greet all the brothers with a set-apart kiss. I charge you by the Master that this letter be read to all the set-apart brothers. The favour of our Master Yeshua Messiah be with you. Amen." 1 Thessalonions 5: 11-28 (ISR98)
So we need to observe this moed (appointed time/rehearsal) of YHVH as we prepare to usher in the return of Messiah!
I pray you have a blessed feast! I FINALLY made sound blowing our shofar tonight! I finally, thanks to the Ruach HaKodesh (Holy Spirit) through me, am a SHOFAR HERO!!! It was not easy but with Abba and Yeshua and the Ruach HaKodesh, all things are possible! Have fun waking up your neighbors tonight with the trumpet blasts...