King James Version (KJV)
And let us not be weary in well doing: for in due season we shall reap, if we faint not.
English Standard Version (ESV)
And let us not grow weary of doing good, for in due season we will reap, if we do not give up.
New International Version (NIV)
Let us not become weary in doing good, for at the proper time we will reap a harvest if we do not give up.