Fathwa - Finding impurities on ones clothes after completing the prayer.

Question:
A man performed the prayer, and some time later, he saw something
impure on his clothes. Should he repeat his prayer, bearing in mind
that the prayer was five months ago?
Answer:
If he did not know that itwas impure, except afterhe finished the
prayer, then his prayer is correct. This is because when the
Prophet(Sallallaahu alayhi wasallam)was informed byJibrilduring his
prayerthat there was something impure on hisshoes, he removed them and
did not repeat the first part of the prayer. The same case if he knows
about it before the prayer, then forgot about it and prayed, not
remembering until after the prayer, based upon the words of Allah, the
Almighty, the All-Powerful:
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"Our Lord! Punish us not if we forget or fall into error"[Surah Al-Baqarah: 286]
And it has been authentically reported from the Prophet(Sallallaahu
alayhi wasallam)that Allah answered this supplication. (Narrated by
Muslim in his Sahih).