Yahya related to me from Malik from Nafi that she saw Safiyya bint Abi Ubayd, the wife of Abdullah ibn 'Umar, take off her head- covering and wipe her head with water. Nafi was a child at the time. Malik was asked about a man who did wudu but forgot to wipe his head until the water had dried. He said, "I consider that he should wipe his head and then repeat the prayer if he has already performed it." Malik was asked about a man who did wudu but forgot to wipe his head until the water had dried. He said, "I consider that he should wipe his head and then repeat the prayer if he has already performed it."  

أَنَّهُ رَأَى صَفِيَّةَ بِنْتَ أَبِي عُبَيْدٍ امْرَأَةَ عَبْدِ اللَّهِ بْنِ عُمَرَ تَنْزِعُ خِمَارَهَا وَتَمْسَحُ عَلَى رَأْسِهَا بِالْمَاءِ وَنَافِعٌ يَوْمَئِذٍ صَغِيرٌ وَسُئِلَ مَالِكٌ عَنِ الْمَسْحِ عَلَى الْعِمَامَةِ وَالْخِمَارِ فَقَالَ لاَ يَنْبَغِي أَنْ يَمْسَحَ الرَّجُلُ وَلاَ الْمَرْأَةُ عَلَى عِمَامَةٍ وَلاَ خِمَارٍ وَلْيَمْسَحَا عَلَى رُءُوسِهِمَا وَسُئِلَ مَالِكٌ عَنْ رَجُلٍ تَوَضَّأَ فَنَسِيَ أَنْ يَمْسَحَ عَلَى رَأْسِهِ حَتَّى جَفَّ وَضُوءُهُ قَالَ أَرَى أَنْ يَمْسَحَ بِرَأْسِهِ وَإِنْ كَانَ قَدْ صَلَّى أَنْ يُعِيدَ الصَّلاَةَ