Midrash sa Mga Bilang 12:14: Sifra, Midrash Tanchuma, Midrash Tanchuma Buber & Pirkei DeRabbi Eliezer

1) kal vachomer (a fortiori): (Bamidbar 12:14): "And the L–rd said to Moses: Now if her (Miriam's) father had spat in her face, would she not be in shame for seven days!" — Kal vachomer, if the Shechinah does so, it should be fourteen days! (see Tosfoth, Bava Kamma 25a). But it suffices that a kal vachomer deduction parallel what it is deduced from; therefore, (Bamidbar 12:14): "Let her be sequestered seven days outside the camp, and then let her be gathered in."

R. Phinehas the priest, the son of Hama and R. Judah the son of Shalum asked: What is meant by gather yourselves together (he’asfu)? It means purify yourselves, as stated in the verse: Let her be shut up within the camp seven days, and after that she shall be purified (te’asef) (Num. 12:14). Another interpretation of gather yourselves. He counted them as elders, as is said: Gather unto me the seventy of the elders of Israel (Num. 11:16).

[(Gen. 49:1:) THEN JACOB CALLED HIS SONS AND SAID: GATHER TOGETHER.] R. Pinhas bar Hama the Priest and R. Judah bar Shallum the Levite said: What is the meaning of GATHER TOGETHER (rt.: 'SP)? Be purified, even as you say (in Numb. 12:14 with reference to Miriam's uncleanness from leprosy): LET HER BE SHUT UP SEVEN DAYS OUTSIDE OF THE CAMP, AND THEN LET HER BE BROUGHT IN (rt.: 'SP).⁴⁴Gen. R. 96, New Version, on Gen. 49:1 (= p. 1204 in the Theodor-Albeck edition; cf. Gen. R. 98:2).