Musnad Ahmad 4244

It was narrated from Ibraheem that al-Aswad and ‘Alqamah were with 'Abdullah in the house. ‘Abdullah said: Did these people pray? They said: Yes. Then he led them in prayer without any adhan or iqamah, and he stood in the midst of them. And he said: If you are three, then do like this, but if you are more then let one of you lead. And let one of you put his hands between his knees when he bows. It is as if I can see the interlaced fingers of the Messenger of Allah (ﷺ).