Some people talk to the person next to them and do not enter the prayer until the imam bows, so what is the ruling?

Question:
Honorable Shaykh, may Allah grant you success, some people arrive while the imam is reciting. Some people arrive while the imam has already entered the prayer and started the recitation, and they sit and talk to the person next to them without entering the prayer until the imam bows. He asks: What is the ruling on that? And is his rak'ah counted despite his negligence?

Answer:
No, standing in the prayer is a pillar, and this is abandoning the standing with negligence. As for if he did not arrive until the imam was bowing, he enters with him and the standing is dropped from him. But if he arrived and sat down or talked to someone, saying, "It is easy, I will catch up with the bowing," no, he will not catch up with the bowing, and this is not valid, because standing is a pillar of the prayer.
The scholars determined it to be the length of al-Fatihah, the length of Surat al-Fatihah. This is a pillar of the prayer that is not dropped except if it is missed. If it is missed, it is dropped. But if you are sitting or talking, it is not dropped from you, and your prayer is not valid either. Yes.