Uqba bin Amir reported,

I heard the Messenger of Allah ﷺ say, "There are two men of my community. One of them rises at night and struggles with himself to perform ablution, for upon him are knots. When he washes his hands, a knot is loosened. When he washes his face, a knot is loosened. When he wipes his head, a knot is loosened. When he washes his feet, a knot is loosened. Then Allah says to those behind the veil, 'Look at this servant of Mine, struggling with himself, asking of Me. Whatever My servant asks of Me, it is his.'"

عن عقبة بن عامر قال

سمعت رسول الله ﷺ يقول: رجلان من أمتي يقوم أحدهما من الليل يعالج نفسه إلى الطهور، وعليه عقد فيتوضأ، فإذا وضأ يديه انحلت عقدة، وإذا وضأ وجهه انحلت عقدة، وإذا مسح برأسه انحلت عقدة، وإذا وضأ رجليه انحلت عقدة. فيقول الله للذين وراء الحجاب: انظروا إلى عبدي هذا يعالج نفسه يسألني، ما سألني عبدي فهو له.