Those who liked to start the prayer over

Ibn Sirin said: The early generation agreed that if he has spoken, he should pray anew; and I like that he should speak and pray anew.

Al-Hasan said: If, while going to perform ablution, a man's back turns towards the qiblah, he should start the prayer anew; and if he turned to his right or to his left, he should complete that same prayer.

Ibrahim said: In the case of a nosebleed, if, while going to perform ablution, his back turns towards the qiblah, I prefer that he start the prayer anew.