וַיְהִ֗י מִסְפַּ֞ר הַֽמֲלַקְקִ֤ים בְּיָדָם֙ אֶל־פִּיהֶ֔ם שְׁלֹ֥שׁ מֵא֖וֹת אִ֑ישׁ וְכֹל֙ יֶ֣תֶר הָעָ֔ם כָּרְע֥וּ עַל־בִּרְכֵיהֶ֖ם לִשְׁתּ֥וֹת מָֽיִם׃ (ס)
And the number of them that lapped, putting their hand to their mouth, was three hundred men; but all the rest of the people bowed down upon their knees to drink water.
Read midrashic interpretation of Judges 7:6: and classical rabbinic exegesis.