Nafi' (may Allah have mercy on him) narrated that Sayyiduna Ibn Umar (may Allah be pleased with them both) would rub and wash his cheeks thoroughly; sometimes he would run his fingers through his beard and sometimes he would leave it. This is how the narrator related it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 252