four portions of scripture in the Tefillin— and 11–16 and and —invalidates the others, and indeed even one imperfect letter can invalidate the whole. Tractate Bekhorot in the Mishnah, Tosefta, and Talmud interpreted the laws of the firstborn in , 12–13; ; and ; and and . Elsewhere, the Mishnah drew from that money in exchange for a firstborn donkey could be given to any Kohen; that if a person weaves the hair of a firstborn donkey into a sack, the sack must be burned; that they did not redeem with the firstborn of a donkey an animal that falls within both wild and domestic categories (a koy); and that one was prohibited to derive benefit in any quantity at all from an unredeemed firstborn donkey. And elsewhere, the Mishnah taught that before the Israelites constructed the Tabernacle, the firstborns performed sacrificial services, but after the Israelites constructed the Tabernacle, the priests (, Kohanim) performed the services. The Gemara reported a number of Rabbis' reports of how the Land of Israel did indeed flow with "milk and honey," as described in and 17, , and , , and 14:8, and , 11:9, 26:9 and 15, 27:3, and 31:20. Once when Rami bar Ezekiel visited Bnei Brak, he saw goats grazing under fig trees while honey was flowing from the figs, and milk dripped from the goats mingling with the fig honey, causing him to remark that it was indeed a land flowing with milk and honey. Rabbi Jacob ben Dostai said that it is about three miles from Lod to Ono, and once he rose up early in the morning and waded all that way up to his ankles in fig honey. Resh Lakish said that he saw the flow of the milk and honey of Sepphoris extend over an area of sixteen miles by sixteen miles. Rabbah bar Bar Hana said that he saw the flow of the milk and honey in all the Land of Israel and the total area was equal to an area of twenty-two parasangs by six parasangs. Rabban Gamaliel taught that in every generation, all are duty bound to regard it as if they personally had gone forth from Egypt, as says, "And you shall tell your son in that day saying, it is because of that which the Lord did for me when I came forth out of Egypt." Reading , "And every