John 9:6

6-7. he spat on the ground, and made clay ... and he anointed the eyes of the blind man--These operations were not so incongruous in their nature as might appear, though it were absurd to imagine that they contributed in the least degree to the effect which followed. (See Mr 6:13 and see on Joh 7:33.)

Robert Jamieson, A. R. Fausset & David Brown, 1871 · public domain

Verse 6. And made clay, &c. Two reasons may be assigned for making this clay, and anointing the eyes with it. One is, that the Jews regarded spittle as medicinal to the eyes when diseased, and that they forbade the use of medicines on the Sabbath. They regarded the Sabbath so strictly that they considered the preparation and use of medicines as contrary to the law. Especially it was particularly forbidden among them to use spittle on that day to heal diseased eyes. See instances in Lightfoot. Jesus, therefore, by making this spittle, showed them that their manner of keeping the day was superstitious, and that he dared to do a thing which they esteemed unlawful. He showed that their interpretation of the law of the Sabbath was contrary to the intention of God, and that his disciples were not bound by their notions of the sacredness of that day. Another reason may have been that it was common for prophets to use some symbolical or expressive action in working miracles. Thus Elisha commanded his staff to be laid on the face of the child that he was about to restore to life, 2Kgs 4:29. Isa 8:18. In such instances the prophet showed that the miracle was wrought by power communicated through him; so, in this case, Jesus by this act showed to the blind man that the power of healing came from him who anointed his eyes. He could not see him, and the act of anointing convinced him of what might have been known without such an act, could he have seen him-- that Jesus had power to give sight to the blind.

(c) "he spat on the ground" Mk 8:23 (1) "anointed", or "spread the clay upon the eyes of the blind man"

Albert Barnes, 1834 · public domain

Verse 6 Anointed the eyes of the blind man - It would be difficult to find out the reason which induced our Lord to act thus. It is certain, this procedure can never be supposed to have been any likely medical means to restore sight to a man who was born blind; this action, therefore, had no tendency to assist the miracle. If his eye-lids had been only so gummed together that they needed nothing but to be suppled and well washed, it is not likely that this could possibly have been omitted from his birth until now. The Jews believed that there was some virtue in spittle to cure the diseases of the eye; but then they always accompanied this with some charm. Our Lord might make clay with the spittle to show that no charms or spells were used, and to draw their attention more particularly to the miracle which he was about to work. Perhaps the best lesson we can learn from this is: That God will do his own work in his own way; and, to hide pride from man, will often accomplish the most beneficial ends by means not only simple or despicable in themselves, but by such also as appear entirely contrary, in their nature and operation, to the end proposed to be effected by them.

Adam Clarke, 1831 · public domain