He'oros On The Akeidah

I was looking through the Minchas Asher on this weeks parsha and he had some interesting he'oros from a halachic perspective.

Here are a couple.

1) Why did Avraham not ride on the donkey all the way to Har HaMoriah?

Chazal say that the Akeidah took place on Yom Kippur. Therefore, it would be assur to ride an animal for fear of breaking a branch. Furthermore, even though two people can ride an animal because they will remind each other not to tear off any branches, Avraham realized that on the way back he would be by himself.

Another answer is that there is a whole discussion in the Shagas Aryeh whether shevisas beheima applies to Yom Tov and Yom Kippur. Avraham was being choshesh for shuch a shitta.

2) Why did Yitzchak not ask where the animal for the korbon was until they got within eyesight of Har Hamoriah.

It is only assur to bring a chayah on the mizbeiyach. On a bama it is muttar. Yitzchak thought they were going to bring a korbon on a bama so he figured they would catch an naimal in the forest. When he saw the mokom hamikdash he realized the korbon would be brought on the mokom hamizbeiyach and they would need a beheimah. So he asked where the animal was.

The Meshech Chochma in Parshas Noach explains the reason for the difference between the mizbeiyach and bama. The Torah didn't want anyone getting hurt/killed by chasing an animal in the forest. Therefore, only beheimos could be brought on the mizbeiyach. The Meshech Chachma explains that this did not apply to Noach after the mabul. Noach brought chayos on the mokom mizbeiyach. Since all the animals were there already there was no chashash that he would get hurt chasing them.