Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) used to say: Whoever finds the imam in the state of bowing before he raises his head has caught the rak'ah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2580
Hadith Gradingمحدثین:صحيح
Hadith Takhrij«صحيح۔ كالذهب مالك عن نافع عن ابن عمر»