Verse 22:[1] Howbeit the hair of his head began to grow again after he was shaven (or, as when he was shaven[2]).
[His hairs began to spring up again, לְצַמֵּ֖חַ כַּאֲשֶׁ֥ר גֻּלָּֽח׃] To spring up again as he had been shaven; that is, as it was when he was shaven (Vatablus). As when he was scraped; that is, unto its former length (Junius). Others: after he was shaven, or shorn (Syriac, Munster, Pagnine). Thus it was appointed once more for the recovery of the gift of his strength, with repentance and prayer added, as is indicated by the following things in verse 28, and by Hebrews 11:32, where he is reckoned among the saints, and is commended for his faith (Bonfrerius, Lapide). Hence they gather that he was not for a long time held captive; for hair cut short begins to regrow immediately (Lapide). He was in prison perhaps for three or four months; for his hair was not able to spring up again more quickly (Menochius).
The hair of his head began to grow again, etc.: This circumstance, though in itself inconsiderable, is noted as a sign of the recovery of God’s favour, and his former strength, in some good degree, upon his bitter repentance, and his renewing of his vow with God, which was allowed for Nazarites to do, Numbers 6:9, etc., and which it is here supposed he did, and by the effects proved.
[1] Hebrew: וַיָּ֧חֶל שְׂעַר־רֹאשׁ֛וֹ לְצַמֵּ֖חַ כַּאֲשֶׁ֥ר גֻּלָּֽח׃
[2] Hebrew: כַּאֲשֶׁ֥ר גֻּלָּֽח׃.