Those who said that if you find the imam bowing and place your hands on your knees before he raises his head, you have caught up with him

Sayyiduna Ibn Umar (may Allah be pleased with them both) said: If you find the imam bowing and you place your hands on your knees before he raises his head, you have caught that rak'ah.

Sa'id bin al-Musayyib said: Whoever joins the imam in bowing before he raises his head has caught that rak'ah.

Dawud said: I asked al-Sha'bi: A man joins the congregation while the people are bowing, but the imam has already raised his head; what is the ruling? He said: You are imams for one another.

Maymun said: When you enter the mosque and see the people bowing, and you say the takbir and bow before they raise their heads, you have caught that rak'ah.