Hadith 34

(The book) ‘Kitab Al-Masaail’ of Ali son of Ja’far-asws, from his brother-asws Musa-asws, he said, ‘I asked him-asws about the one who neglects the recitation, ‘What is it’s state? ’
He-asws said: ‘If it was deliberate, there is no Salat for him, but if he had forgotten, there is no problem’’. [90]
And from him, he said, ‘I asked him-asws about the man beginning the Chapter, so he recites part of it, then he errs and takes in (reciting) another until he ends it, then he comes to know that he had mistaken, ‘Is it for him to return to the one which he had begun with, and even if he had done Ruk’u and Sajdah? ’
He-asws said: ‘If he had not done Ruk’u, let him return to the one he loves, and if he had done Ruk’u, let him continue’. And I asked him-asws about the man who mistakes in his recitation, ‘Is it for him to be silent for a while and he remembers? ’
He-asws said: ‘There is no problem’. And I asked him-asws about the man reciting in his salat, ‘Is it allowed for him not to go out and imagines imaginations? ’
He-asws said: ‘There is no problem’’. [91]