NET
31 When Moses saw it, he was amazed at the sight, and when he approached to investigate, there came the voice of the Lord,
Darby
31 And Moses seeing it wondered at the vision; and as he went up to consider it, there was a voice of [the] Lord,
KJV
31 When Moses saw [it], he wondered at the sight: and as he drew near to behold [it], the voice of the Lord came unto him,