Lip

In the NT the Gr. word χει̂λος, G5927, was used both literally and metaphorically in exactly the same sense as in the OT (Matt 15:8; Rom 3:13; Heb 13:15; 1 Pet 3:10 [LXX]).

International Standard Bible Encyclopedia (1915)

(saphah, sepheth, "lip," "language," "speech," "talk" (also "rim," "border," "shore," "bank," etc.), sapham, "(upper) lip," "moustache," "beard"; cheilos, "lip" (also once, "shore" in the quotation Heb 11:12 equals Ge 22:17)):

(2) The Hebrew word sapham is found only in the phrase "to cover the lip or lips," which is an expression of mourning, submission and shame. The Oriental covers his lips with his hand or a portion of his garment, when he has been sunk into deep grief and sorrow. He expresses, thereby, that he cannot open his mouth at the visitation of God. Differently, however, from common mourners, Ezekiel was forbidden of God "to cover his lips" (Eze 24:17; see also Eze 24:22), i.e. to mourn in the usual way over Israel’s downfall, as Israel had brought these judgments upon himself. The leper, victim of an incurable disease, walks about with rent clothes and hair disheveled, covering his lips, crying: "Unclean, unclean!" (Le 13:45). The thought here is that even the breath of such a one may defile. The prophet calls upon all seers and diviners, to whom God has refused the knowledge of the future, to cover their lips in shame and confusion (Mic 3:7).