וַיִּהְיוּ־שָׁ֤ם עִם־דָּוִיד֙ יָמִ֣ים שְׁלוֹשָׁ֔ה אֹכְלִ֖ים וְשׁוֹתִ֑ים כִּֽי־הֵכִ֥ינוּ לָהֶ֖ם אֲחֵיהֶֽם׃
And they were there with David three days, eating and drinking; for their brethren had made preparation for them.
Read kabbalistic (mystical) interpretation of I Chronicles 12:40: and classical mystical sources.