Imam Malik, may Allah have mercy on him, was asked: Is there any hadith regarding performing istinja with water after urination or defecation? He replied: It has reached me from some of the Salaf that they used to perform istinja with water after defecation, and I consider it good to perform istinja with water after urination.
Hadith Referenceموطا امام مالك رواية يحييٰ / كتاب الطهارة / 141