وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، 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 ‏.‏

Yahya related to me from Malik from Nafi that she saw Safiyyabint 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 wipehis head until the water had dried. He said, "I consider that heshould wipe his head and then repeat the prayer if he has alreadyperformed it." Malik was asked about a man who did wudu butforgot to wipe his head until the water had dried. He said, "Iconsider that he should wipe his head and then repeat the prayer if hehas already performed it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 2 Hadith 71
Web Ref:  Muwatta Imam Malik Book 2 Hadith 41