Moses
Exodus 24:10BSB·traditional attribution

and they saw the God of Israel. Under His feet was a work like a pavement made of sapphire, as clear as the sky itself.

Matthew Henry Presbyterian @wholebiblehenry

The people having, besides their submission to the ceremony of the sprinkling of blood, declared their well-pleasedness in their God and his law, again and again, God here gives to their representatives some special tokens of his favour to them (for God meets him that rejoices and works righteousness), and admits them nearer to him than they could have expected.

Commenting on Exodus 24:9-11

John Gill Reformed Baptist @doctorgill

And they saw the God of Israel,.... The Targum of Jonathan restrains this to Nadab and Abihu whereas it is doubtless true of Moses and Aaron, and the seventy elders, who all saw him, and who were witnesses to the people that it was a divine Person that spoke to Moses, and delivered the laws unto him, to be observed by them; which seems to...

Jamieson-Fausset-Brown Reformed @jfbcommentary

And they saw the God of Israel--That there was no visible form or representation of the divine nature, we have expressly intimated (Deu 4:15). But a symbol or emblem of His glory was distinctly, and at a distance, displayed before those chosen witnesses.