What is the ruling on ablution for continuous white or yellow discharge that does not cease, and is it permissible to combine two prayers with one ablution in cases of necessity, such as during 'Umrah or weddings?

The preponderant view is that vaginal discharge is pure but nullifies ablution. If its emission is continuous, then it is obligatory to perform ablution for each prayer after its time has begun. It is permissible to combine two prayers with a single ablution according to the Hanbalis, due to necessity.