It is narrated from Hazrat Bara’ (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to walk from one end of the row to the other, straightening the chests and shoulders of the worshippers, and he used to say: "Do not move forward or backward, otherwise differences will arise in your hearts." And he used to say: "Allah Almighty sends mercy upon those in the first rows, and the angels continue to supplicate for mercy for them."