"5And when thou prayest, thou shalt not be as the hypocrites are: for they love to pray standing in the synagogues and in the corners of the streets, that they may be seen of men. Verily I say unto you, They have their reward. 6But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.
7But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking. 8Be not ye therefore like unto them: for your Father knoweth what things ye have need of, before ye ask him."
https://biblehub.com/kjv/matthew/6.htm
"The book of Acts also teaches us that prayer is an authorized work of the church. As noted above, when Peter was imprisoned, “constant prayer was offered to God for him by the church” (Acts 12:5). It is following a biblical pattern for churches to set aside times for prayer"
https://focusmagazine.org/prayer-in-the-early-church-patterns-in-acts.php
"Group prayer among Christians is important and rewarding. It has been this way from the beginning of the church."
https://www.gotquestions.org/group-prayer.html