ויבו [וַיָּב֨וֹא] יָרָבְעָ֧ם וְכָל־הָעָ֛ם אֶל־רְחַבְעָ֖ם בַּיּ֣וֹם הַשְּׁלִישִׁ֑י כַּאֲשֶׁ֨ר דִּבֶּ֤ר הַמֶּ֙לֶךְ֙ לֵאמֹ֔ר שׁ֥וּבוּ אֵלַ֖י בַּיּ֥וֹם הַשְּׁלִישִֽׁי׃
Also kamen Jerobeam und das ganze Volk am dritten Tag nach Rehabeam, als der König befahl und sagte: 'Komm am dritten Tag wieder zu mir.'
Rashi on I Kings
My little finger is thicker. My little finger.1the beginning of his reign, Rechovom was 41 years old [See below 14:21], but Shlomo was only 12 years old when he became king [See above 3:7 and Rashi there].—Ralbag