'Stumbling' in the Bible

There is none weary, nor stumbling in it, It doth not slumber, nor sleep, Nor opened hath been the girdle of its loins, Nor drawn away the latchet of its sandals.

And He hath been for a sanctuary, And for a stone of stumbling, and for a rock of falling, To the two houses of Israel, For a gin and for a snare to the inhabitants of Jerusalem.

Strengthen ye the feeble hands, Yea, the stumbling knees strengthen.