Abigail speaks of herself and David as if they are two other people, to show that she respects David. Alternate translation: "my trespass ... you ... you are" (See: [[rc://en/ta/man/jit/figs-pronouns]])
Here "house" is an idiom used for "descendants." Alternate translation: "Yahweh will ensure that my master always has a descendant who serves as king" (See: [[rc://en/ta/man/jit/figs-idiom]])
This can be translated in active form. Alternate translation: "no one will ever see you do any evil thing" or "you will never do anything evil" (See: [[rc://en/ta/man/jit/figs-activepassive]])