Seforno: In order to have the appropriate Kavanah as each part of the sacrifice was being sacrificed. ¹

Oznayim la'Torah: Because it is correct for the owner to stand by his Korban whilst it is being sacrificed. ²

Rashi: Because Hashem was not accustomed to appearing to him by day. ¹

Seforno: Because he was not on the level of Moshe, who, once he was established, was assured of Hashem's attention at any time. ² And he figured that perhaps Hashem would come to meet him, like He came to meet Moshe when he first became a prophet. ³

Rashi, R. Bachye #1 and Targum Onkelos: It means 'He went alone'.

R. Bachye #2 (citing the Ibn Ezra): It means ?to a high place? - as if it had written ?Vayeilech el Shefi?. ^{1 2}

R. Bachye #3: It means he was lame in one leg. ^{3 4}

Rashbam: It means 'He went limping', ⁵

Targum Yonasan: It means 'He went doubled-over ⁶ like a snake'. ⁷