«كان إذا واقع بعض أهله فكسل أن يقوم ضرب يده على الحائط فتيمم»
It was the practice of the Prophet (peace and blessings be upon him):
"When he (peace and blessings be upon him) had intercourse with one of his wives and felt reluctant to get up (for the ritual bath), he would strike his hand on the wall and perform tayammum."
Hadith Referenceصحیح الجامع الصغیر / حرف الكاف / 4794
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[طس] عن عائشة. آداب الزفاف ص ٤٠ - ٤١.