GOD'S WORD® Translation
Then your fasting won't be obvious. Instead, it will be obvious to your Father who is with you in private. Your Father sees what you do in private. He will reward you.

American Standard Version
that thou be not seen of men to fast, but of thy Father who is in secret: and thy Father, who seeth in secret, shall recompense thee.

Berean Study Bible
so that your fasting will not be obvious to men, but only to your Father, who is unseen. And your Father, who sees what is done in secret, will reward you.

Douay-Rheims Bible
That thou appear not to men to fast, but to thy Father who is in secret: and thy Father who seeth in secret, will repay thee.

English Revised Version
that thou be not seen of men to fast, but of thy Father which is in secret: and thy Father, which seeth in secret, shall recompense thee.

King James Bible
That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which seeth in secret, shall reward thee openly.

World English Bible
so that you are not seen by men to be fasting, but by your Father who is in secret, and your Father, who sees in secret, will reward you.

Young's Literal Translation
that thou mayest not appear to men fasting, but to thy Father who is in secret, and thy Father, who is seeing in secret, shall reward thee manifestly.

Matthew 6:18 Additional Translations ...