Midrash su Salmi 68:14

...and when the Israelite women conceived, they would return to their homes. When they were about to go into labor, the women would go out into the fields and give birth in the apple orchards, as it is written: "I woke you under the apple [tree]" (Song of Songs 8:5). And the Lord Blessed be He would send an angel from the heavens who cleaned them and made them beautiful, just as a new mother grooms her infant, as it is written: "And as for your birth, on the day you were born..." (Ezekiel 16:4), and He grants them two round cakes, one of oil and the other of honey, as it is written: "And He [God] suckled Him [ The Children of Israel] with honey from the rock..." (Deuteronomy 32:13). And as soon as the Egyptians would become aware of this, they sought to kill them. And a miracle happened, and the cihldren were swallowed up by the earth, and bulls would come and plow the ground above them, as it is written: "Upon my back the plowers plowed" (Psalms 129:3). And once the Egyptians would pass, the infants would rise up from the mud like grass from the field, as it is written: "I have made you grow like the plantlings in the field..." (Ezekiel 16:7) And when the babes grew, they would flock to their homes in great droves, as it says: "And you came in all your finest and dressiest," (Ezekiel 16:7) - do not read "finest and dressiest" but rather "flocked in droves." And when the Lord Blessed be He revealed Himself at the Sea of Reeds, they were the first to recognize Him instantly, as it says: "THIS is my God, and I will praise Him." (Exodus 15:2).

R. Akiba expounded: "As a reward for the righteous women who lived in that generation was Israel redeemed from Egypt; for when the women went out to fill water, the Holy One, praised be He, prepared for them small fish that would be filled in their pitchers. Thus one-half of the pitcher was filled with water and the one-half with fish. They would come home and put two pots on the fire, one containing hot water and the other the fish. They would then bring it to their husbands; with the water they would wash their feet, and their limbs. They would then feed them with the fish and give them to drink, thus refreshing their husbands during such rigorous work, as it is said (Ps. 68, 14) When ye lie still between the folds of thy cattle; i.e., in reward for your lying between the folds [of your cattle] Israel merited to enjoy the spoils of the Egyptians, as it is said there. The wings of the dove are covered with silver and her pinions with the shimmer of gold. And as soon as these women became pregnant, and were about to give birth to their children they would go and give birth in the field under an apple tree; [as it is said (Songs 8, 8) Under the apple tree have I waked thee up; there thy mother brought thee forth, there brought she ye forth where she bore thee], where the Holy One, praised be He, would send a Heavenly messenger to cleanse them, make them goodlooking like a midwife that cleanses an infant, as it is said (Ez. 16, 4) And as for thy birth on the day thou wast born thy navel was not cut, nor wast thou washed in water to be cleansed; and thou wast not rubbed with salt, nor wrapped in swaddling clothes, and these angels gave to them two round cakes, one of honey and one of oil, as it is said (Deut. 32, 13) And he made him to suck honey out of the rock, and oil out of flinty stone; and as soon as the Egyptians learned of their existence they would come to kill them but miracles always happened that they were swallowed by the earth and the Egyptians would bring oxen to plow over the place where they were swallowed, as it is said (Ps. 129, 3) Upon my back have plow-men plowed. After the Egyptians would leave, these youngsters would grow out from the earth like grass in the field, as it is said (Ez. 16, 7) Myriads, like the vegetation of the field, did I make of thee, etc. And after these children grew up they would come in flocks to their homes, as it is said (Ib., ib., ib.) And thou attained the highest attractions with thy breasts developed, and thy hair full grown; i.e., do not read (adiadayim ) with thy breast developed, but read it b'adri adarim, in whole flocks. And when the Holy One, praised be He, revealed Himself at the Red Sea, these recognized Him at first, as it is said (Ex. 15, 2) He is my God and I will declare His praise."

And she hath no breasts indicates that as yet he had no children. What shall we do for our sister in the day that she shall be spoken for alludes to the day in which Nimrod ordered him hurled into the fiery furnace. If she be a wall we will build upon her a turret of silver implies that if Abraham would set his soul as firm as a wall to withstand Nimrod’s many attacks and to accept martyrdom in order to sanctify the Name of the Holy One, blessed be He, we will build upon her a turret of silver for his defense. A turret of silver refers to the Israelites, whom He called: The wings of the dove … covered with silver (Ps. 68:14). And if she be a door (delet) implies that if he should waver (dal) in his willingness to undergo martyrdom, then we would enclose (nasur) him with boards of cedar. Just as a drawing (sura) on a board of cedar is speedily erased, so Abraham (would have been speedily eliminated, for) I would not have protected him.