Musar su Genesi 8:6

According to this, the homiletical meaning Rashi speaks about, namely the comparison of someone who fails to carry out that commandment to a murderer as stated by Rabbi Eliezer in Yevamot 63, is based on the verse immediately prior to that in which the Torah proclaims: שופך דם האדם באדם דמו ישפך, "Whoever sheds the blood of man, by man shall his blood be shed." He apparently holds that only males are commanded to fulfil this commandment, and disagrees with Rabbi Yochanan ben Broka. The latter holds that the line "He blessed them," applied to both man and woman. The reason that the other scholar disagrees is that he holds that just as only males are in the habit of conquering, a condition in Genesis 1,28, so only males have to fulfil the condition of being fruitful. Clearly then he must hold that the words "He said to them, etc." must be understood as a commandment. The same reasoning applies to the first time the words פרו ורבו appear in Genesis 9,1. Rabbi Yochanan would then be in disagreement with Bar Kappara and the Talmud Sanhedrin 59, who both hold that the commandment is only found in Genesis 9,7, i.e. ואתם פרו ורבו. Nonetheless he interprets these verses homiletically on the basis of Rabbi Eliezer who believes that a homiletical explanation based on matters which appear side by side in the Torah is almost a commandment in itself [words are mine. Ed.]. Rabbi Eliezer bases his approach to exegesis on Psalms 111,8: סמוכים לעד לעולם, that words next to one another always, i.e. under all conditions, have an exegetical significance. Rabbi Eliezer applies that principle even when the verses in question are not "free" for homiletics but have already been explained as necessary in a different context.