firstborn of a donkey you shall redeem with a lamb," and , "and the firstborn of a donkey you shall redeem with a lamb," the Mishnah noted that the Torah states this law twice, and deduced that one is therefore not obligated under this law unless both the animal that gives birth is a donkey and the animal born is a donkey. The Mishnah thus concluded that a cow that gave birth to a calf like a donkey and a donkey that gave birth to a foal like a horse are exempt from their offspring being considered a firstborn. In medieval Jewish interpretation The parashah is discussed in these medieval Jewish sources: Exodus chapter 10 Reading God's command to Moses in , "Go in to Pharaoh; for I have hardened his heart, and the heart of his servants," and similar statements in ; , , 27; ; and , 8, and 17, Maimonides concluded that it is possible for a person to commit such a great sin, or so many sins, that God decrees that the punishment for these willing and knowing acts is the removal of the privilege of repentance (teshuvah). The offender would thus be prevented from doing repentance, and would not have the power to return from the offense, and the offender would die and be lost because of the offense. Maimonides read this to be what God said in , "Make the heart of this people fat, and make their ears heavy, and their eyes weak, lest they see with their eyes and hear with their ears, and their hearts will understand, do repentance and be healed." Similarly reports, "They ridiculed the messengers of God, disdained His words and insulted His prophets until the anger of God rose upon the people, without possibility of healing." Maimonides interpreted these verses to teach that they sinned willingly and to such an egregious extent that they deserved to have repentance withheld from them. Because Pharaoh sinned on his own at the beginning, harming the Jews who lived in his land, as reports him scheming, "Let us deal craftily with them," God issued the judgment that repentance would be withheld from Pharaoh until he received his punishment. Therefore, God said in , "I will harden the heart of Pharaoh." Maimonides explained that God sent Moses to tell Pharaoh to send out the Jews and do repentance, when God had already