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Ka`b bin 'Ujra said that Allah's Messenger (ﷺ) said to him (Ka`b), "Perhaps your lice have troubled you?" Ka`b replied, "Yes! O Allah's Messenger (ﷺ) ." Allah's Messenger (ﷺ) said, "Have your head shaved and then either fast three days or

Do these vermins trouble your head? He said: Yes. Thereupon he (the Prophet) said: Shave your head. Then sacrifice a goat or observe fasts for three days or give three sits of dates to feed six needy persons.

“The Prophet (ﷺ) commanded me, when I was suffering, from live, to shave my head and fast for three days or feed six poor persons. He knew that I did not have an animal I could sacrifice.”