Mic 7:5

“[In spiritual discipline], the disposition of the doer is given more weight than the thing that is done. Even the truth at times is found to have harmed some people and a lie to have helped them. For one time King Saul was complaining in the presence of his retainers about David's flight, saying, "Will the son of Jesse give all of you fields and vineyards and make all of you tribunes and centurions, since you have all conspired against me, and there is no one to inform me?" What but the truth did Doeg the Edomite tell him when he said, "I saw the son of Jesse in Nob, with Ahimilech the son of Ahitub the priest. He consulted the Lord on his behalf and gave him provisions and he gave him the sword of Goliath the Philistines as well"? For this truth he deserved to be uprooted from the land of the living, and of him it is said by the prophet, "Therefore God shall destroy you forever, pluck you up and remove you from your tent and uproot you from the land of the living." For indicating the truth, then, he was everlastingly uprooted from the land in which Rahab the harlot was planted, along with her family, because of her lie. In the same way we remember that Samson in most ruinous fashion delivered over to his wicked wife a truth that had long been concealed by a lie. Therefore the truth that he had very heedlessly disclosed to her brought about his own undoing, because he failed to keep that prophetic command: "Keep the doors of your mouth from her who sleeps at your breast."”

“Believe not a friend [This is to be understood] according to its apparent meaning. But our Sages explained it as referring to the Most High. Do not sin and say that the Holy One, blessed be He, is our Friend, and He will forgive us. [from Hagiga 16a] from her who lies in your bosom—Your soul will testify against you. the openings of your mouth Heb. פִּתְחֵי. The words of your mouth, the openings of your mouth.”

“Bosom. In times of general distress, even domestics are not trusted; because all are solicitous for themselves, even to the prejudice of others. (Worthington) — Before the ruin of Israel civil wars raged, 4 Kings xv. Our Saviour alludes to this passage, Matthew x. 35., Luke xii. 52., and xxi. 16. People will rise up to oppress true believers; and these must abandon their nearest relations, when they prove an obstacle to salvation. Thus is the moral, and the other the literal sense. (Calmet)”

“Trust ye not in a friend--Faith is kept nowhere: all to a man are treacherous (Jer 9:2-6). When justice is perverted by the great, faith nowhere is safe. So, in gospel times of persecution, "a man's foes are they of his own household" (Mat 10:35-36; Luk 12:53). guide--a counsellor [CALVIN] able to help and advise (compare Psa 118:8-9; Psa 146:3). The head of your family, to whom all the members of the family would naturally repair in emergencies. Similarly the Hebrew is translated in Jos 22:14 and "chief friends" in Pro 16:28 [GROTIUS]. her that lieth in thy bosom--thy wife (Deu 13:6).”