'Deal Loyally' in the Bible

So now, {if you are going to deal loyally and truly} with my master, tell me. And if not, tell me, so that I may turn to [the] right or to [the] left."

And when the time drew near for Israel to die, he called his son Joseph and said to him, “If now I have found favor in your sight, please put your hand under my thigh and [promise to] deal loyally and faithfully with me. Please do not bury me in Egypt,