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SB 8.17.18

tvayārcitaś cāham apatya-guptaye
 payo-vratenānuguṇaṁ samīḍitaḥ
svāṁśena putratvam upetya te sutān
 goptāsmi mārīca-tapasy adhiṣṭhitaḥ
Synonyms: 
tvayā — by you; arcitaḥ — being worshiped; ca — also; aham — I; apatya-guptaye — giving protection to your sons; payaḥ-vratena — by the payo-vrata vow; anuguṇam — as far as possible; samīḍitaḥ — properly worshiped; sva-aṁśena — by My plenary portion; putratvam — becoming your son; upetya — taking this opportunity; te sutān — to your other sons; goptā asmi — I shall give protection; mārīca — of Kaśyapa Muni; tapasi — in the austerity; adhiṣṭhitaḥ — situated.
Translation: 
You have prayed to Me and properly worshiped Me by performing the great payo-vrata ceremony for the sake of protecting your sons. Because of Kaśyapa Muni’s austerities, I shall agree to become your son and thus protect your other sons.