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]^D7770 Lord,

Darby Bible Notes

[the] - The sentence is without the article and therefore much more emphatic. 'Lord' is a solemn title. The expression amounts to 'there came an utterance of Jehovah.'

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,

Strong's

31 When ^G1161 Moses^G3475 saw^G1492 it he wondered^G2296 at the sight^G3705: and^G1161 as he^G846 drew near^G4334 to behold^G2657 it the voice^G5456 of the Lord^G2962 came^G1096 unto^G4314 him^G846,