Sunan Abi Dawud 349
سنن أبي داود#349Sahihحَدَّثَنَا مَحْمُودُ بْنُ خَالِدٍ الدِّمَشْقِيُّ، أَخْبَرَنَا مَرْوَانُ، حَدَّثَنَا عَلِيُّ بْنُ حَوْشَبٍ، قَالَ سَأَلْتُ مَكْحُولاً عَنْ هَذَا الْقَوْلِ، " غَسَّلَ وَاغْتَسَلَ " . فَقَالَ غَسَّلَ رَأْسَهُ وَغَسَلَ جَسَدَهُ .
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)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih Maqtu
Muhammad Muhyi Al-Din Abdul HamidSahih Maqtu
Zubair Ali ZaiIsnaad Sahih
In-book reference: 1:349