וַיֹּ֤אמֶר אַבְנֵר֙ אֶל יוֹאָ֔ב יָק֤וּמוּ נָא֙ הַנְּעָרִ֔ים וִֽישַׂחֲק֖וּ לְפָנֵ֑ינוּplugin-autotooltip__default plugin-autotooltip_bigפָנִים

hebrew

Meaning:

* Face * Presence * Front or surface

Noun. Masculine. Although it looks plural in form (ending in -ים), it is almost always used as a singular in meaning - a type of plural of intensity or plural of form common in Hebrew for body parts that come in pairs or have multiple aspects.
וַיֹּ֥אמֶר יוֹאָ֖ב יָקֻֽמוּ