1 Samuel 17:39

And he girded David with his sword over his coat: and he made trial walking [with them] once and again: and David said to Saul, I shall not be able to go with these, for I have not proved [them]: so they remove them from him.

And David girded his sword upon his armour, and he assayed to go; for he had not proved it. And David said unto Saul, I cannot go with these; for I have not proved them. And David put them off him.

David strapped his sword on his clothing and he tried to move, for he had not tested it. David said to Saul, “I can’t go with these, for I have not tested them.” Then David took them off.