Uqba bin Amir reported,

I heard the Prophet ﷺ say, "There are two men of my community. One of them rises in the night, struggling with himself to reach the water for purification, with the knots still bound upon him. He performs wudu, and when he washes his hands a knot is loosened, and when he washes his face a knot is loosened, and when he wipes his head a knot is loosened, and when he washes his feet a knot is loosened. Then Allah says to those who are behind the veil, 'Look at this servant of Mine, struggling with himself, asking of Me. Whatever My servant asks of Me is his.'"

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