Hadith 1612
Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) saw his companions staying behind in the rows, so he said: "Move forward and follow me in prayer, and those behind you should follow you, and some people keep staying behind until Allah also puts them behind." This is the narration of Waki'.