23 The LORD answered Moses, “Is the LORD’s arm too short? Now you will see whether or not what I say will come true for you.”

Read Numbers 11:23 Using Other Translations

And the LORD said unto Moses, Is the LORD'S hand waxed short? thou shalt see now whether my word shall come to pass unto thee or not.
And the LORD said to Moses, "Is the LORD's hand shortened? Now you shall see whether my word will come true for you or not."
Then the LORD said to Moses, “Has my arm lost its power? Now you will see whether or not my word comes true!”