They were all trying to frighten us, thinking, "Their hands will get too weak for the work, and it will not be completed." But I prayed, "Now strengthen my hands." (NIV)
For they all wanted to frighten us, thinking, Their hands will be so weak that the work will not be done. But now strengthen my hands! (AMP)
For they all made us afraid, saying, Their hands shall be weakened from the work, that it be not done. Now therefore, O God, strengthen my hands. (KJV)