Matthew 12:50

Whosoever shall do the will. — This is, then, what Christ recognises as the ground of a spiritual relationship. Not outward, but inward fellowship; not the mere fact of baptism, but that which baptism signifies; that doing the will of God, which is the essence of holiness — this is that which makes the disciple as dear to the heart of Christ as was the mother whom He loved so truly.

Sister, and mother. — The special mention of the sister suggests the thought that those who bore that name had joined the mother and the brethren in their attempt to interrupt the divine work.