הִנֵּ֤ה ׀ יַבִּ֘יע֤וּן בְּפִיהֶ֗ם חֲ֭רָבוֹת בְּשִׂפְתוֹתֵיהֶ֑ם כִּי־מִ֥י שֹׁמֵֽעַ׃
Voici qu’ils donnent libre carrière à leur bouche; sur leurs lèvres ils ont des glaives: "car (se disent-ils) qui peut les entendre?"
Radak
Day to day uttereth speech, And night unto night sheweth knowledge. – יביע, uttereth, i.e. “speaks,” as “Behold, they utter (speak) (יביעון) ivith their mouth” (Ps. 59:8); “Let my lips utter (תנענה) praise” (ibid. 119:171). The interpretation of the verse is: To-day speaks for the sake of the day that comes after it, and to-night for the sake of the night which shall follow it; meaning, in the orderly sequence of the movements (of the heavenly bodies) by day and night as it has been since the six days of Creation, so it is now, and so it shall be for ever: nothing is changed or altered. If so, to-day tells for the sake of to-morrow, for it is certain that so it shall be.