New Living Translation
When he heard this, he sighed deeply in his spirit and said, “Why do these people keep demanding a miraculous sign? I tell you the truth, I will not give this generation any such sign.”

American Standard Version
And he sighed deeply in his spirit, and saith, Why doth this generation seek a sign? verily I say unto you, There shall no sign be given unto this generation.

Berean Study Bible
Jesus sighed deeply in His spirit and said, “Why does this generation demand a sign? Truly I tell you, no sign will be given to this generation.”

Douay-Rheims Bible
And sighing deeply in spirit, he saith: Why doth this generation seek a sign? Amen, I say to you, a sign shall not be given to this generation.

English Revised Version
And he sighed deeply in his spirit, and saith, Why doth this generation seek a sign? verily I say unto you, There shall no sign be given unto this generation.

King James Bible
And he sighed deeply in his spirit, and saith, Why doth this generation seek after a sign? verily I say unto you, There shall no sign be given unto this generation.

World English Bible
He sighed deeply in his spirit, and said, "Why does this generation seek a sign? Most certainly I tell you, no sign will be given to this generation."

Young's Literal Translation
and having sighed deeply in his spirit, he saith, 'Why doth this generation seek after a sign? Verily I say to you, no sign shall be given to this generation.'

Mark 8:12 Additional Translations ...