Musnad Ahmad

It is narrated from Hukm, may Allah have mercy on him, that during the days of Ibn Ash'ath's rebellion, Mutarrif bin Najiyah appointed Abu Ubaidah bin Abdullah, may Allah be pleased with him, to lead the prayer. When he would rise from bowing (ruku'), he would stand for as long as it would take me to say these words (the translation of which is: O Allah, O our Lord, all praise is for You, as much as would fill the heavens and fill the earth and fill whatever else You will. Whatever You give to someone, none can withhold, and whatever You withhold from someone, none can give, and the rank of any rank-holder is of no avail before You). It is narrated from Bara' bin Azib, may Allah be pleased with him, that the manner of the Prophet's (peace and blessings be upon him) prayer was such that when he prayed, bowed, rose from bowing, prostrated, raised his head from prostration, and between the two prostrations, at all these points, the duration was equal.