At-Tawbah 9:108 لا تقم فيه ابدا لمسجد اسس على التقوى من اول يوم احق ان تقوم فيه فيه رجال يحبون ان يتطهروا والله يحب المطهرين ١٠٨

Never stand you therein. Verily, the mosque whose foundation was laid from the first day on piety is more worthy that you stand therein (to pray). In it are men who love to clean and to purify themselves. And Allâh loves those who make themselves clean and pure [i.e. who clean their private parts with dust (which has the properties of soap) and water from urine and stools, after answering the call of nature].