[ἀλυσιτελής] from G1 (as a negative particle) and the base of G3081; gainless, i.e. (by implication) pernicious
Usages throughout the bible
Hebrews 13:17
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Obey them that have the rule over you, and submit yourselves: for they watch for your souls, as they that must give account, that they may do it with joy, and not with grief: for that is unprofitable G255 for you.