What is the ruling on the prayer of one upon whom Fajr dawned, and he found a fluid on his inner garments, so he completed his ablution, then removed the garments, performed tayammum, and went to pray in the mosque?

The cases of wetness discharged after sleep are summarized into three:

1. Semen (Mani): If it is confirmed to be semen (by smell or color), then a ghusl (ritual bath) is obligatory, and the prayers performed after the last sleep must be repeated (according to the majority of scholars). 2. Pre-seminal fluid (Madhi): If it is confirmed to be madhi, then the prayer is valid after washing what the madhi has touched of the body and clothes, then performing wudu (ablution) and praying with pure clothes. 3. Uncertainty: If the type of wetness is unknown, one has the choice between considering it semen (in which case one performs ghusl and repeats the prayers), or madhi (in which case one washes the impurity, performs wudu, and their prayer is valid).

Tayammum (dry ablution) is not valid here, because it is prescribed only when water is unavailable or one is unable to use it.