Acts 12:5

So Peter was being kept in prison, but earnest prayer to God for him was persistently made by the church.

2 Corinthians 1:11

because you are helping me by your prayers for me, so that thanks to God will be given by many on my behalf for God's gracious gift to me in answer to the prayers of many.

Matthew 18:19

"Again, I tell you, if only two of you on earth agree on what they pray for, they will get it from my Father in heaven.

Luke 18:1

Now He told them the following story to show how necessary it is for people always to pray and never to give up:

Acts 12:12

When he became conscious of his situation, he went to the house of Mary, the mother of John who was also called Mark, were a large number of people had met and were praying.

1 Corinthians 12:26

If one part suffers, all the parts suffer with it. If one part receives an honor, all the parts can share its joy.

Ephesians 6:18-20

Keep on praying in the Spirit, with every kind of prayer and entreaty, at every opportunity, be ever on the alert with perfect devotion and entreaty for all God's people,

1 Thessalonians 5:17

Never stop praying.

Hebrews 13:3

Continue to remember those who are in prison, as though you were in prison with them, and those who are being ill-treated, since you, too, are liable to similar physical punishment.

James 5:16

So practice confessing your sins to one another, and praying for one another, that you may be cured. An upright man's prayer, when it keeps at work, is very powerful.

Treasury of Scripture Knowledge

Summary

Peter therefore was kept in prison: but prayer was made without ceasing of the church unto God for him.

General references

Bible References

Prayer was made without ceasing, or, instant and earnest prayer was made

Acts 12:12
When he became conscious of his situation, he went to the house of Mary, the mother of John who was also called Mark, were a large number of people had met and were praying.
Matthew 18:19
"Again, I tell you, if only two of you on earth agree on what they pray for, they will get it from my Father in heaven.
Luke 18:1
Now He told them the following story to show how necessary it is for people always to pray and never to give up:
1 Corinthians 12:26
If one part suffers, all the parts suffer with it. If one part receives an honor, all the parts can share its joy.
2 Corinthians 1:11
because you are helping me by your prayers for me, so that thanks to God will be given by many on my behalf for God's gracious gift to me in answer to the prayers of many.
Ephesians 6:18
Keep on praying in the Spirit, with every kind of prayer and entreaty, at every opportunity, be ever on the alert with perfect devotion and entreaty for all God's people,
1 Thessalonians 5:17
Never stop praying.
Hebrews 13:3
Continue to remember those who are in prison, as though you were in prison with them, and those who are being ill-treated, since you, too, are liable to similar physical punishment.
James 5:16
So practice confessing your sins to one another, and praying for one another, that you may be cured. An upright man's prayer, when it keeps at work, is very powerful.

General references

Acts 5:18
they had the apostles arrested and put into the common jail.