ESV: Then Moses answered, "But behold, they will not believe me or listen to my voice, for they will say, ‘The Lord did not appear to you.’"
NIV: Moses answered, "What if they do not believe me or listen to me and say, ‘The Lord did not appear to you’?"
NASB: Then Moses said, 'What if they will not believe me or listen to what I say? For they may say, ‘The Lord has not appeared to you.’?'
CSB: Moses answered, "What if they won’t believe me and will not obey me but say, ‘The Lord did not appear to you’?"
NLT: But Moses protested again, 'What if they won’t believe me or listen to me? What if they say, ‘The Lord never appeared to you’?'
KJV: And Moses answered and said, But, behold, they will not believe me, nor hearken unto my voice: for they will say, The Lord hath not appeared unto thee.
NKJV: Then Moses answered and said, “But suppose they will not believe me or listen to my voice; suppose they say, ‘The Lord has not appeared to you.’ ”