John 9:6
After He had said this, He spat on the ground and made mud with the saliva. Then He put the mud on the man's eyes
Mark 7:33
So, Jesus took him away from the crowd by himself and put His fingers into the man's ears. Then He spit and touched the man's tongue [i.e., with His saliva]
Mark 8:23
[So], He took hold of the blind man by his hand and brought him out of the village. When Jesus spit [and put His saliva] on his eyes [See 7:33 for a similar use of His saliva in healing] and placed His hands on him [for healing], He asked him, "Can you see anything?"
Revelation 3:18
[Because of that], I advise you to buy from me gold, refined by fire, so that you will become rich; and white clothing to wear, so that you can cover yourself and not be seen as shamefully naked; and eye drops for your eyes, so that you can see. [Note: The foregoing all refer to taking measures for becoming more spiritual].