Rashi on Genesis 27:3/רש"י על בראשית כ״ז:ג׳

1שא נא — The word שא means sharpen, similar to what שא read in the Mishna (Beitzah 28a) “One may not sharpen the knife in the usual manner but one may sharpen it by passing it (משיאין) over another”. Isaac said to Esau, “Sharpen your knife and slaughter an animal according to the regulations so that you may not give me to eat נבלה” (i.e. the flesh of animal that is not killed according to the ritual rules) (Genesis Rabbah 65:13).

2תליך means thy sword which is usually hung (at the side).

3צודה לי AND HUNT FOR ME [SOME VENISON] of animals that are ownerless, but not of such as are acquired by theft (literally, by robbery).