Silsilah as-Sahihah 603 — There should be a gap between obligatory

It is narrated from a companion of the Messenger of Allah that the Messenger of Allah (peace and blessings be upon him) led the Asr prayer. (After the salam) a man immediately started to pray. Sayyiduna Umar (may Allah be pleased with him) saw him and said: "Sit down, the People of the Book were destroyed because there was no interval in their prayers." The Messenger of Allah (peace and blessings be upon him) said: "Ibn Khattab has done well."