Abu Ghalib narrates: I heard Sayyiduna Abu Umamah (may Allah be pleased with him) say: "When you complete the ablution on its proper places, you sit down forgiven. Then if you pray, it will be a virtue and a reward for you; and if you remain seated, you are still sitting forgiven." A man said to him: O Abu Umamah, if he stands up and prays, will it be nafl (additional) for him while he remains caught up in sins and errors? He said: "It will indeed be a virtue and a reward for you."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 8031