Hazrat Ata also says the same.

Hazrat Ibn Sirin says that if ablution breaks before saying salam, the prayer is not complete.

Hazrat Ata says that if after saying "As-salamu 'alayna wa 'ala 'ibadillahis-saliheen" in Tashahhud, the ablution breaks, then his prayer is complete.

Hazrat Hakam and Hazrat Hammad state that until a person recites the Tashahhud or sits for the duration of the Tashahhud, the prayer is not complete.

Hazrat Mak’hool says that if a person experiences hadath (minor impurity) after reciting the Tashahhud, his prayer will be considered complete.

Hazrat Ibn Musayyib says: Do you know which prayer is such that one sits after every rak'ah? It is the prayer of a person who catches one rak'ah of Maghrib; he will sit after every rak'ah.

Ibrahim narrates that Hazrat Masruq and Hazrat Jundub caught one rak'ah of Maghrib. When the Imam finished with salam, Hazrat Masruq stood up, performed one rak'ah, and then sat down; Jundub performed two rak'ahs and then sat for tashahhud. When this matter was mentioned to Hazrat Abdullah, he said that both acted well, but Masruq's action is more preferable to me, and I would also do the same.

Ibrahim narrates that Hazrat Jundub and Hazrat Masruq once set out with the intention of offering the Maghrib prayer. Both of them caught one rak‘ah of Maghrib with the Imam. When the Imam finished the prayer with salam, during the completion of their remaining prayer, Hazrat Masruq sat after the second rak‘ah, while Hazrat Jundub did not sit. In the rak‘ah that was performed with the Imam, Hazrat Jundub recited (Qira’at), but Hazrat Masruq did not recite. When the actions of both of them were mentioned before Hazrat Abdullah bin Mas‘ud (may Allah be pleased with him), he said that both did well, but I would do as Masruq did.

Hazrat Sa’d says that whoever joins the Imam in any one of the four rak’ahs should perform only the final sitting (qa’dah) after the last rak’ah, because there are only two sittings (qa’dahs) in the prayer.

Hasan says that whoever catches one rak'ah with the imam in Maghrib prayer will sit after every rak'ah.