So Peter was kept in the prison, but prayer for him was being made fervently by the ekklesia/edah to God.
Acts 12:5


Pray without ceasing.
I Thessalonians 5:17


Confess your sins to one another, and pray for one another, so that you may be healed. The effective prayer of a righteous man accomplishes much.
James 5:16


Since you have in obedience to the truth purified your souls for a sincere love of the brethren, fervently/earnestly love one another from a clean/true heart.
I Peter 1:22


Prayer is an uprising of the mind to God or a petitioning of God for what is fitting.
John of Damascus, book 3


 PRAYERS FROM THE BIBLE

Daniel's Prayer: Daniel 9:4-19
Elijah's Prayer at Mt. Carmel: I Kings 18:36-39
Hannah's Prayer of Thanksgiving: I Samuel 2:1-10
Jehoshaphat For Deliverance: II Chronicles 20:6-9
Jonah: Jonah 2:2-9
Nehemiah's Prayer: Nehemiah 1:5-11
The Lord's Prayer: Matthew 6:9-13 & Luke 11:2-4
Apostles For Divine Direction: Acts 1:24,25
Apostles & Believer’s Prayer: Acts 4:24-30
Stephen for His Murderers: Acts 7:60
Paul For the Corinthians: II Corinthians 13:7
Paul For the Ephesians: Ephesians 3:14-21
Paul For the Philippians: Philippians 1:9-11
Paul For the Colossians: Colossians 1:9-17

 
A memorable prayer meeting started on August 27, 1727. This prayer meeting went on continuously for 100 years. It was held twenty-four hours a day until 1827, the year of the beginnings of the Plymouth Brethren in England. At the start, twenty-four brothers and sisters at Herrnhut bound themselves to continue in an unceasing chain of prayer, from one midnight to the next. Each devoted one hour in the day or night to fellowship with the Lord and to intercede for the church and the community. As the number of participants increased, their intercession included all the churches of the Brethren with their bands, individuals, missionaries, the land in which they dwelt, the magistrates and teachers, and the human race in general. Thus, silence was kept neither day nor night before the Lord.

The leaders of the church in China try to pray three to four hours a day. That is normal. But then there are some brethren who are totally committed to pray. Almost every minute they are awake, they are praying. They cannot even be elders in the church because of the amount of time they spend in prayer.
  


 PRAY FOR LOVE

In deep dread, August Francke fell to his knees pleading with God for salvation from his miserable state. He later said, “I arose a completely different person from the one who had knelt down.” August was aware that many who attended church were not born of God, and he pleaded with them to test themselves by the test of loving one's brother.