Halakhah sur La Genèse 22:5

It is forbidden to utter sinister forbodings against a fellow Jew, even just to say [about a missing person], "If so and so were alive he would have come here," for "A covenant was made with the lips."⁸The Gemara [Moed Katan 18a] explains that predictions, whether favorable or otherwise, have a way of becoming reality. When preparing to sacrifice his son, Yitzchak, on the akeidah, Abraham said to his young men; “The boy and I will go to that place … and then return to you,” (Gen. 22:5). His words came true and both did return unscathed. You should not frighten a child with an unclean thing, by saying for instance, "A cat or a dog will get you." You should be very careful [to avoid] habitual use of such similar expressions.

And they, may their memory be blessed, said further as a reason for this (Yevamot 62b) that a Canaanite slave does not have relationship - meaning to say that behold, he is like a beast in this matter. And Scripture indicates this, from that which it is written (Genesis 22:5), "Sit here with (eem) the donkey" - and they, may their memory be blessed, expounded, "A people (am, which is spelled the same way as eem) similar to a donkey"; and they were the slaves of Avraham, our father. And nonetheless, they are [included] in the prohibition of males and beasts, according to the opinion of Rambam, may his memory be blessed. And the reason is correct; as about this, it is not applicable to say [that] he has no relationship. And they are also forbidden from having intercourse with the married woman of an Israelite; as also about them is it not applicable to say [that] he has no relationship. And they are likewise forbidden with a menstruant, and even [in the case of] a maidservant - as [the latter] are liable for all of the punishments in the Torah. And explicitly did they, may their memory be blessed, expound (Sifra, Metzora Parashat Zavim, Section 5:1), "'And when a woman discharges' (Leviticus 15:19) - whether an Israelitess or whether a maidservant; whether a convert or a freed [maidservant]."