Sources for Tzippora

(6) If a bird’s nest chance to be before thee in the way, in any tree or on the ground, with young ones or eggs, and the mother bird sitting upon the young, or upon the eggs, thou shalt not take the dam with the young; (7) thou shalt in any wise let the dam go, but the young thou mayest take unto thyself; that it may be well with thee, and that thou mayest prolong thy days.

(1) [The law of] sending [away the mother bird from] the nest [before taking the eggs] applies in the land [of Israel] and outside of the land, at the time of the Temple and not during the time of the Temple, for chulin [produce or food permitted for general consumption] but not for for mukdashim [animals or food which are holy and not available for general consumption]... And sending [the mother bird from] the nest only applies for a bird, and only applies when it is not in possession. Which one is not in possession? For example, geese and chickens which nested in the field.

About honouring parents, it is written, "In order that your days will be lengthened, and in order that it would be good for you" (Deuteronomy 5:15). About sending away the mother bird, it is written, "In order that it will be good for you and your days will be lengthened" (Deuteronomy 22:7). For when his father says to him, "Go up to the attic and bring me chicks!" And he goes up to the attic, sends away the mother [bird], and takes the children, but on his return, he falls and dies. Where is the goodness of this one's days? Where are the lengthening of this one's days? Rather, "In order that it be good for you"—in the world which is all good; "And in order that your days will be lengthened"—in the world which is all long.

(9) He said to them: Go out and see what is a straight path that a person should cling to. Rabbi Eliezer says: a good eye. Rabbi Yehoshua says: A good friend. Rabbi Yosi says: A good neighbor. Rabbi Shimon says: Seeing the consequences of one's actions. Rabbi Elazar says: A good heart. He said to them: I see the words of Rabbi Elazar son of Arach [as better than] all of yours, because your words are included in his.