It is narrated from Sayyiduna Abu Ayyash al-Zuraqi (may Allah be pleased with him), who said: the Messenger of Allah (peace and blessings be upon him) led us in the Zuhr prayer at Usfan, while the idolaters were commanded by Khalid bin al-Walid. The idolaters said: "If only we could have attacked them suddenly." Then they said: "Now a prayer is coming upon them that is dearer to them than their children and their own selves." So Jibril (peace be upon him) came down with the verses about the prayer of fear. He (peace and blessings be upon him) arranged the Companions in two rows behind him, then said the takbir and we all said the takbir; he bowed and we all bowed; and he prostrated and the near row prostrated. When he (peace and blessings be upon him) stood up, the near row moved back and stood in the place of the rear row, and the rear row moved forward and stood in their place. Then he (peace and blessings be upon him) bowed and we all bowed, then he raised his head and we all raised ours, and the near row prostrated. When he (peace and blessings be upon him) sat, the rear row prostrated.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5118