Peter assumes leadership here and (we can imagine somewhat grudgingly) moved the group from the mountain to the muck. Then he explains to his brothers that they need a replacement for Judas right away, not because of his death, but because of his defection. Let’s continue with Acts 1:15-26
When you have a difficult task to do, base it on Scripture.
During this period, when the group of believers numbered about 120, Kefa (Peter) stood up and addressed his fellow-believers: “Brothers, the Ruach HaKodesh (Holy Spirit) spoke in advance through David about Y’hudah (Judas), and these words of the Tanakh had to be fulfilled. He was guide for those who arrested Yeshua — he was one of us and had been assigned a part in our work.” (With the money Y’hudah (Judas) received for his evil deed, he bought a field; and there he fell to his death. His body swelled up and burst open, and all his insides spilled out. This became known to everyone in Yerushalayim (Jerusalem), so they called that field Hakal-D’ma — which in their language means “Field of Blood”). “Now,” said Kefa (Peter), “it is written in the book of Psalms,
‘Let his estate become desolate, let there be no one to live in it’;
‘Let someone else take his place as a supervisor.’
Therefore, one of the men who have been with us continuously throughout the time the Lord Yeshua traveled around among us, from the time Yochanan (John the Baptist) was immersing people until the day Yeshua was taken up from us — one of these must become a witness with us to his resurrection.”
They nominated two men — Yosef Bar-Sabba (Joseph Barsabbas), surnamed Justus, and Mattityahu (Matthias). Then they prayed, “Lord, you know everyone’s heart. Show us which of these two you have chosen to take over the work and the office of emissary that Y’hudah (Judas) abandoned to go where he belongs.” Then they drew lots to decide between the two, and the lot fell to Mattityahu (Matthias). So he was added to the eleven emissaries.
Acts 1:15-26 (CJB)
Here we see an address by Peter, to the group of 120 people. It is clear in these passages and others that Peter was a leader and no doubt this was because Yeshua more or less publically declared him so when He said:
And I say to you that you are Peter, and on this rock I will build My church; and the gates of Hades (death) will not overpower it [by preventing the resurrection of the Christ].
Matthew 16:18 (AMP)
When the opening words of verse 15 say, “During this period”, it means during the 1 week period of time between Yeshua’s ascension and the fulfillment of “what the Father promised” that would give power to Yeshua’s disciples. It was a period of time in which none of them were to leave Jerusalem.
The Biblical Feast of Shavuot was due in 1 week from Yeshua’s ascension; but did the disciples know or think that “what the Father promised” (whatever that might be) was going to occur on Shavuot (Pentecost in Greek)?
There is no evidence that they knew what it was going to be or when it was going to happen, only where: in Jerusalem.
Thus Peter follows His Master’s advice to stop focusing on the unknown and deal with the now. And the matter that Peter felt was important at the moment was to replace Judas and get the number of disciples back up to 12.
But first, why was it so important that there were 12 disciples instead of the current 11?
That will be the topic we’ll begin with in my next blog post.