12 Then they returned to Jerusalem from the mount called Olivet, which is near Jerusalem, a Sabbath day’s journey away. 13 And when they had entered, they went up to the upper room, where they were staying, Peter and John and James and Andrew, Philip and Thomas, Bartholomew and Matthew, James the son of Alphaeus and Simon the Zealot and Judas the son of James. 14 All these with one accord were devoting themselves to prayer, together with the women and Mary the mother of Jesus, and his brothers.[c]
15 In those days Peter stood up among the brothers (the company of persons was in all about 120) and said, 16 “Brothers, the Scripture had to be fulfilled, which the Holy Spirit spoke beforehand by the mouth of David concerning Judas, who became a guide to those who arrested Jesus. 17 For he was numbered among us and was allotted his share in this ministry.” 18 (Now this man acquired a field with the reward of his wickedness, and falling headlong[d] he burst open in the middle and all his bowels gushed out. 19 And it became known to all the inhabitants of Jerusalem, so that the field was called in their own language Akeldama, that is, Field of Blood.) 20 “For it is written in the Book of Psalms,
“‘May his camp become desolate,
and let there be no one to dwell in it’;
and
“‘Let another take his office.’
Diggin Deep With Student Impact 
Christ has just left them. I can’t imagine how lonely and scared they were. Their response, was to devote themselves to prayer. I pray, and I know it is important to talk to God and to tell Him my heart. But my response in life is not often to devote myself to prayer. I don’t communicate with God like it is the most important thing that I am going to do that day. I am convicted to work on my prayer muscle.