It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him): I heard the Messenger of Allah (peace and blessings be upon him) say: "O people, I have grown old, so do not precede me in (going into) bowing and prostration; rather, I should stay ahead of you, so that you make up what you have missed."
(b) We did not retain from our shaykhs the correct vowelling of whether it is 'badantu' or 'baddantu', but Abu Ubayd preferred 'baddantu', that is, with a doubled dal carrying a fathah, the meaning being 'I have grown old'; and those who read it 'badultu' with a dammah on the dal mean by it: 'My body has become heavy.'
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2598