If someone bowed behind the rows, [on entering the mosque and before joining the rows of Salat (prayer)]

Narrated Abu Bakra: I reached the Prophet (ﷺ) in the mosque while he was bowing in prayer and I too bowed before joining the row mentioned it to the Prophet (ﷺ) and he said to me, "May Allah increase your love for the good. But do not repeat it again (bowing in that way).