Assalamualaikum warohmatullahi wabarokatuhu ahsanallahu ilaik my question is I went bathroom for call of nature after obligatory prayer and saw madhi in my pant and I don't know when it came, do I have to pray again my salah?

Imam Ibn Baz may Allah have mercy on him said: “If a person is uncertain and does not know whether this came out during the prayer or after the prayer, then he is not required to repeat the prayer. If he is unsure about that urine or madhy he found traces of — whether it occurred during the prayer or after it — then he does not have to repeat the prayer.”