New International Version
Immediately the boy's father exclaimed, "I do believe; help me overcome my unbelief!"

American Standard Version
Straightway the father of the child cried out, and said, I believe; help thou mine unbelief.

Berean Study Bible
Immediately the boy’s father cried out, “I do believe; help my unbelief!”

Douay-Rheims Bible
And immediately the father of the boy crying out, with tears said: I do believe, Lord: help my unbelief.

English Revised Version
Straightway the father of the child cried out, and said, I believe; help thou mine unbelief.

King James Bible
And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.

World English Bible
Immediately the father of the child cried out with tears, "I believe. Help my unbelief!"

Young's Literal Translation
and immediately the father of the child, having cried out, with tears said, 'I believe, sir; be helping mine unbelief.'

Mark 9:24 Additional Translations ...