{Which knoweth the heart} (kardiogn(9373)t(8873)). Late word from
kardia (heart) and gn(9373)t(8873) (known, gin(9373)k(935c)). In the N.T.
only here and  1:24  which see. {Giving them the Holy Spirit}
(dous to pneuma to hagion). And before their baptism. This was
the Lord's doing. They had accepted ( 11:18 ) this witness of God
then and it was true now of these other Gentile converts.