KJV : And <2532> when they had fulfilled <5048> (5660) the days <2250>, as <1722> they <846> returned <5290> (5721), the child <3816> Jesus <2424> tarried behind <5278> (5656) in <1722> Jerusalem <2419>; and <2532> Joseph <2501> and <2532> his <846> mother <3384> knew <1097> (5627) not <3756> [of it].

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NASB : and as they were returning, after spending the full number of days, the boy Jesus stayed behind in Jerusalem. But His parents were unaware of it,

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NASB# : and as they were returning<5290>, after spending<5048> the full<5048> number<5048> of days<2250>, the boy<3816> Jesus<2424> stayed<5278> behind<5278> in Jerusalem<2419>. But His parents<1118> were unaware<3756><1097> of it,