The strongest evidence supporting this is that wudu is an obligatory act, and it is not permissible to perform prayer without it unless there is a specific legal proof. In the case of these ghusls (e.g., for Friday), there is no definitive legal evidence that exempts one from performing wudu, making its obligation necessary. This does not apply to the exemption of wudu in the case of ghusl for janabah, as we have based that on legal evidence: the consensus of the community (ijma‘) that ghusl for janabah and wudu, when combined, suffices for both. Furthermore, the narrations we have transmitted affirm and clarify this ruling.
Commentary #32