Implying distinction in quality rather than numerical distinction (ἄλλος). For example, “whoever smiteth thee on thy right cheek, turn to him the other (τὴν ἄλλην); i.e., the other one of the two (Mat 5:39). At Pentecost, the disciples began to speak with other (ἑτέραις) tongues; i.e., different from their native tongues. Here the word gives the idea of two masters of distinct or opposite character and interests, like God and Mammon.
Hold to (ἀνθέξεται)
The preposition ἀντί, against, indicates holding to the one master as against the other. He who is for God must be against Mammon.