Musannaf Ibn Abi Shaybah

Ibn Sirin states that there is consensus among the predecessors that if he has spoken, he should perform the prayer anew, and I prefer that after conversing, he should perform the prayer again.

Hasan says that if, while going for ablution, a person's back turns towards the Qiblah, then he should perform the prayer anew; and if he has turned to the right or left, then he should complete that same prayer.

Ibrahim says that in the case of a nosebleed, if while going to perform ablution his back turns towards the Qiblah, then I prefer that he should perform the prayer anew.