The Catechism in Questions & Answers

721. What do we know about the prayers of the early Christians?

The early Christians practised communal prayer: “These all continued with one accord in prayer and supplication, with the women and Mary the mother of Jesus, and with His brothers” (Acts 1: 14).
Accounts of intensive prayers are also recorded in association with significant events, for example the choosing of Matthias as an Apostle or the ordination of the first seven Deacons.
The Apostles were also accompanied by the prayers of the congregation in situations of danger (cf. Acts 12: 1-12).

Deacons: see Question 470.

“But we will give ourselves continually to prayer and to the ministry of the word.”
Acts 6: 4