Allah's Messenger (ﷺ) saw him (i.e. Ka'b) while the lice were falling on his face.
Sahih al-Bukhari Book 27, Hadith 13
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(Reporting the speech of Ka`b bin Umra) Allah's Messenger (ﷺ) saw him (i.e. Ka`b) while the lice were falling on his face. He asked (him), "Have your lice troubled you?" He replied in the affirmative. So, he ordered him to get his head shaved while he was at Al-Hudaibiya. At that time they were not permitted to finish their Ihram, and were still hoping to enter Mecca. So, Allah revealed the verses of Al-Fidya. Allah's Messenger (ﷺ) ordered him to feed six poor persons with one Faraq of food or to slaughter one sheep (as a sacrifice) or to fast for three days.
Sahih al-Bukhari Book 27, Hadith 12 Next Hadith → Allah's Messenger (ﷺ) said, "Whoever performs Hajj to this House (Ka`ba) and does not approach his wife for sexual relations nor commits sins (while performing Hajj), he will come out as sinless as a newlyborn child. (Just delivered by his mother).
Sahih al-Bukhari Book 27, Hadith 14
Sahih al-Bukhari Book 27, Hadith 12 Next Hadith → Allah's Messenger (ﷺ) said, "Whoever performs Hajj to this House (Ka`ba) and does not approach his wife for sexual relations nor commits sins (while performing Hajj), he will come out as sinless as a newlyborn child. (Just delivered by his mother).
Sahih al-Bukhari Book 27, Hadith 14