Pharisaism
Public Prayer
Matthew 6:5 And when you pray, do not be as the hypocrites, because they love to pray in the assembly halls and standing at the corners of the streets, that they should be seen by men. Truly I say to you, they have their reward! 6 But when you would pray, go into your closet and closing your door you shall pray to your Father who is in secret, and your Father who sees shall yield to you in secret.
In 1 Samuel chapter 1, we see that Hannah's prayer was answered when her lips moved, but she spoke it not, having prayed in her heart. Likewise, the prophet Daniel prayed alone in his room, and it was not necessarily his intention that he be seen through his window by his enemies, as it is related in Daniel chapter 6. Daniel and Hannah, while seen by others, were both praying privately. The apostles often prayed together, but they prayed privately, and not to make a show in front of others.
Christians who insist on public prayer, or that others must pray with them, are simply looking for a crutch. They want others to see how “pious” they are, that they may justify themselves. Real Christians do not need crutches, nor do they need outward displays of piety, which are pretentious. We should have no need to be seen praying publicly or with others. We should seek our God with our hearts and display our love through good deeds for our brethren, and not merely in the pretense of exhibition.