Albert Barnes Commentary Mark 10:19

"Thou knowest the commandments, Do not kill, Do not commit adultery, Do not steal, Do not bear false witness, Do not defraud, Honor thy father and mother." — Mark 10:19 (ASV)

Defraud not. Do not take away your neighbour's property by fraud or dishonesty. To cheat or defraud supposes a covetous desire of a neighbour's property, and is usually attended with falsehood or false witness against a neighbour in obtaining it. It is thus a violation of the ninth and tenth commandments; and our Saviour very properly, therefore, condensed the two, and expressed their substance in this—not to defraud. It is, besides, expressly forbidden in Leviticus 19:13—Thou shalt not defraud thy neighbour.