Does prayer become void by the intention, contingent upon repeating it, should something be found to have exited during prayer, and what should be done when in doubt about the validity of ablution during prayer?

One of the jurisprudential principles is that certainty is not removed by doubt. So, whoever was in a state of ritual purity and doubted the invalidation of his ablution, his ablution is not invalidated, whether he is in prayer or outside of it. This is supported by the noble hadith: "He should not leave until he hears a sound or perceives a smell." Therefore, an incidental doubt does not harm certainty, and this is the view of the majority of scholars. Accordingly, no attention should be paid to doubt about something exiting during prayer, and the thought of repeating the prayer if the impurity becomes clear does not constitute a breaking of intention.