וַיֹּ֤אמֶר הַמֶּ֙לֶךְ֙ אֶל־עֲמָשָׂ֔א הַזְעֶק־לִ֥י אֶת־אִישׁ־יְהוּדָ֖ה שְׁלֹ֣שֶׁת יָמִ֑ים וְאַתָּ֖ה פֹּ֥ה עֲמֹֽד׃
Then said the king to Amasa: ‘Call me the men of Judah together within three days, and be thou here present.’
Read midrashic interpretation of II Samuel 20:4: and classical rabbinic exegesis.