New International Version
He replied, "This kind can come out only by prayer."

American Standard Version
And he said unto them, This kind can come out by nothing, save by prayer.

Berean Study Bible
Jesus answered, “This kind cannot come out, except by prayer.”

Douay-Rheims Bible
And he said to them: This kind can go out by nothing, but by prayer and fasting.

English Revised Version
And he said unto them, This kind can come out by nothing, save by prayer.

King James Bible
And he said unto them, This kind can come forth by nothing, but by prayer and fasting.

World English Bible
He said to them, "This kind can come out by nothing, except by prayer and fasting."

Young's Literal Translation
And he said to them, 'This kind is able to come forth with nothing except with prayer and fasting.'

Mark 9:29 Additional Translations ...