The Mysteries of Saint John the Apostle and Holy Virgin 13

1And I said unto the Cherubim, 'O my Lord, what is the sign which is in the sons of Adam?' And the Cherubim said unto me, 'At the moment when the ice (or, cold) was about to come upon the earth, the first things which went cold in the body of the man were his finger nails. Because at the time when God deprived Adam of the righteousness wherein he was arrayed, the first things which grew cold were his finger nails. And he wept, and cried out to the Lord, saying, Woe is me, O my Lord. At the time when I kept the commandments of God, and before I did eat of the [fruit of] the tree, my whole body was white like my nails. For this reason every time Adam looked upon his nails, he used to cry out and weep, even as Hezekiah, when he was sick, used to turn towards the wall, and weep.'

See also: 2 Kings 20:2, Isaiah 38:2

2[And I answered and said unto the Cherubim, 'When Hezekiah] was weeping, why did he not look at a man [instead of a wall]?' And the Cherubim said unto me, '[Hearken], and I will make everything manifest to you, O faithful virgin. Now it came to pass in the time of Solomon that the king compelled all the demons to describe to him all the various kinds [of sicknesses], and the remedies which were to be employed in healing them all, and the various kinds of herbs which must be used in relieving the pains of sicknesses, and Solomon wrote them all down upon the wall in the House of God. And any man who was attacked by a sickness [or, disease], no matter of what kind, used to go into the temple, and look upon the wall, until he found there written the remedy which was suitable for his sickness; then he would take that remedy, and would go into his house, ascribing glory to God. And it came to pass that, after Solomon the king was dead, Hezekiah plastered over the walls of the temple with lime, and the prescriptions for the relief of sickness could no longer be found. Now when Hezekiah the king had fallen sick, and was sick unto death, he could not find the prescription whereby to heal his sickness, because it was he himself who had plastered over the walls of the temple with lime. And when the prescriptions which had been written upon them could not be found again, he went into the house of the Lord, and lay down there, and he looked upon the wall, and he wept, saying, "My Lord, let not that which I have done in the matter of plastering over with lime the walls, whereon were inscribed the prescriptions for healing, be held to be a sin [by Thee], for I said, Let men make supplication to God with hope, and they shall find healing. Never shall I find a prescription for healing whereby I may be made whole." And the Lord heard [him], and had compassion upon him, and sent unto him Isaiah the Prophet, and he spake unto him, saying, "Take the fruit (?) of the wild fig-tree, and plaster it over thy body, and thou shalt find relief." Now therefore, O John, God will never forsake the man who performeth [His commandments].'