Samuel grew, as in stature, so in wisdom and piety, and God's favour, and reputation with the people. Fall to the ground, i.e. want its effect or success; God made good all his predictions. A metaphor from precious liquors, which when they are spilt upon the ground, are altogether useless and ineffectual. This phrase is oft used, as Joshua 21:45 Esther 6:10, &c.
Related Commentaries of 1 Samuel 3:19
1 Samuel 3:19
19 And Samuel grew, and the LORD was with him, and did let none of his words fall to the ground.