Had not wherewith to pay (μη εχοντος αυτου αποδουνα). There is no "wherewith" in the Greek. This idiom is seen in Luke 7:42; Luke 14:14; Hebrews 6:13. Genitive absolute though αυτον in the same clause as often in the N.T.

To be sold (πραθηνα). First aorist passive infinitive of πιπρασκω. This was according to the law (Exodus 22:3; Leviticus 25:39; Leviticus 25:47). Wife and children were treated as property in those primitive times.