As have been baptized into Christ. Or unto eiv -- the same preposition which, in Ga 3:24, is rendered unto Christ. That is, they were baptized with reference to him, or receiving him as the Saviour. See this explained See Barnes "Ro 6:3".

Have put on Christ. That is, they have put on his sentiments, opinions, characteristic traits, etc., as a man clothes himself. This language was common among the ancient writers. See Barnes "Ro 13:14".

{c} "For as many of you" Ro 6:3