Is it obligatory to repeat the Fajr prayer and the prayers preceding it after seeing a strange spot following recovery from the discharge of pus?

The spot found on clothing has different scenarios: 1. If it is semen (maniyy): Ritual bathing (ghusl (definition)) is required, whether nocturnal emission (ihtilam) is mentioned or not. 2. If it is pre-ejaculate (madhiy): The part of the garment or body that it touched must be washed, and the penis must be washed. 3. If its nature is unknown: If you wish, you can consider it semen, in which case ghusl is required. If you wish, you can consider it madhiy, in which case washing the penis only suffices.

If the discharge is considered madhiy and you prayed unknowingly of its impurity, you do not need to repeat the prayer. However, if the discharge is considered semen, ghusl is obligatory, and you must repeat the prayers performed after the last sleep, unless it is more likely that the discharge occurred before that, in which case prayers should be repeated from the sleep during which nocturnal emission is more likely to have occurred.