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+ 246 He would also say: Five years is the age for the study of Scripture. Ten, for the study of Mishnah. Thirteen, for the obligation to observe the mitzvot. Fifteen, for the study of Talmud. Eighteen, for marriage. Twenty, to pursue [a livelihood]. Thirty, for strength, Forty, for understanding. Fifty, for counsel. Sixty, for sagacity. Seventy, for elderliness. Eighty, for power. Ninety, to stoop. A hundred-year-old is as one who has died and passed away and has been negated from the world. Pirkei Avot 5:22

+ 246 “Ani ma’amin be-emunah shelemah” (“I believe with perfect faith”) – Rendition of Maimonides’ thirteen-point version of the Jewish principles of faith

+ 317 The evidence from anthropology concurs with history in refuting the popular belief in a Jewish race descended from the biblical tribe. From the anthropologist's point of view, two groups of facts militate against this belief: the wide diversity of Jews with regard to physical characteristics, and their similarity to the Gentile population amidst whom they live. Both are reflected in the statistics about bodily height, cranial index, blood-groups, hair and eye colour, etc. Whichever of these anthropological criteria is taken as an indicator, it shows a greater similarity between Jews and their Gentile host-nation than between Jews living in different countries. ...The obvious biological explanation for both phenomena is miscegenation, which took different forms in different historical situations: intermarriage, large-scale proselytizing, rape as a constant (legalized or tolerated) accompaniment of war and pogrom. The Thirteenth Tribe (1976). Arthur Koestler

+ 145 For twelve years they served Chedorlaomer, and for thirteen years they rebelled. Bereshit 14:4

+ 178 And Ishmael his son was thirteen years old, when he was circumcised of the flesh of his foreskin. Bereshit 17:25

+ 76 You shall offer up a burnt offering, a fire offering for a spirit of satisfaction to the Lord: thirteen young bulls, two rams, fourteen lambs in the first year; they shall all be unblemished. Bamidbar 29:13

+ 71 And their meal offering shall be fine flour mixed with oil; three tenths for each bull for the thirteen bulls, two tenths for each ram for the two rams. Bamidbar 29:14

+ 89 Very superstitious, writings on the wall, very superstitious, ladders 'bout to fall, Thirteen month old baby, broke the lookin' glass, seven years of bad luck, the good things in your past. Stevie Wonder