Commento su Deuteronomio 28:61

יעלם is a form from the root עלה (not from עלם).

The connotation is rising up. The מ"ם of this word is grammatical and indicates the plural. It is not an expression of concealment as in (Eicha 3:56), “Do not conceal (תעלם) Your ear,” in which case it would be explained like (verse 59), “Adonoy will strike you with prodigious (והפלא) blows,” i.e., they will be separate and hidden from every living thing, because if so, it should have been punctuated with a shva under the עי"ן as in the verse “Do not conceal (תעלם) Your ear,” and “will hide their eyes” (העלם יעלימו) (Vayikra 20:4). Furthermore, it should have said יעלימם ה' עליך, since it is referring to the plagues. (Re”m). This is difficult to understand because in all the texts יעלם is punctuated with a shva like העלם יעלימו which is also punctuated with a shva. Therefore we must say that Rashi does not differentiate between whether it is punctuated with a shva or a chataf shva, and his main proof is that it should have written יעלימם. Alternatively, his proof is that if it was an expression of concealment, the phrase [following] “against you” would not be understandable.

אשר לא כתוב, “which have not been recorded (in the Torah);” the Chaldeans used to tie good looking male Jews to their bedposts during the time they engaged in sexual relations with their wives, in order that their wives at the time by looking at these good looking males would become aroused and their babies would resemble what they had seen at that time. It happened once that one of them told his colleague that this is what has been written here, i.e. what is meant by “perversions which have not been recorded in the Torah.” (Talmud, tractate Gittin folio 58.)