Allah does not accept the prayer of any of you who is in the state of Hadath (minor ritual impurity) until he performs ablution

The Prophet (may Allah's peace and blessings be upon him) clarified that Tahārah (ritual purity) is one of the conditions for the validity of prayer. Hence, whoever wants to pray must make Wudū’ (ablution) if he has already nullified his Wudū’ by defecating, urinating, sleeping, etc.