Sunan Abi Dawud, Hadith 349 ⓘ
Makhul was asked about the meaning of words ghassala and ightasala (that occur in tradition 345) and he said: one should was one's head and body well (and not than one should makes one's wife wash).
حَدَّثَنَا مَحْمُودُ بْنُ خَالِدٍ الدِّمَشْقِيُّ، أَخْبَرَنَا مَرْوَانُ، حَدَّثَنَا عَلِيُّ بْنُ حَوْشَبٍ، قَالَ سَأَلْتُ مَكْحُولاً عَنْ هَذَا الْقَوْلِ، " غَسَّلَ وَاغْتَسَلَ " . فَقَالَ غَسَّلَ رَأْسَهُ وَغَسَلَ جَسَدَهُ .
also referenced under: Hadith 349 (DarusSalam) & Book 1, Hadith 349 (USC-MSA)