Midrash su Salmi 35:13

(Fol. 12b) Rabba b. Chinena, the Senior, in the name of Rab, said further: "Whoever is able to pray for mercy on behalf of his friend and does not pray, is to be called a sinner; as it is said (I Sam. 12, 23.) Moreover as for me, far be it from me that I should sin against the Lord by ceasing to pray in your behalf." Raba said: "If he who is the sick be a great man, his friend should pray for him until he himself is worn out." What is the reason? Shall we say because it is written (Ib. 22, 8.) And there is none who sickens for me nor informeth me? Perhaps this refers only to a King? But we learn it from this, (Ps. 35, 13.) But as for me, when they were sick, my clothing was sackcloth. Further said Rabba b. Chinena, the Senior, in the name of Rab: "He, who after committing a transgression, feels ashamed, will be forgiven of all his sins, as it is said (Ez. 16, 63.) In order that thou mayest remember, and feel ashamed and never open thy mouth any more because of thy shame. When I forgive thee for all that thou hast done saith the Lord God." Perhaps a community [to which that refers] is different? But we learn from this, (I Sam. 28. 15.) And Samuel said unto Saul, Why hast thou disquieted me? And Saul answered, I am greatly distressed for the Philistines make war against me, and God has departed from me and hath not answered me any more, neither by the agency of the prophets, nor by means of dreams: therefore I have called thee, that thou mayest make known unto me what I shall do. And he fails to mention the Urim and Tummim; he was ashamed to mention these because he killed all the priests of Nob who performed that rite. And whence do we learn that his sins were forgiven by Heaven? It is said (Ib.) And Samuel said unto Saul, to-morrow shalt thou and thy sons be with me, and R. Jochanan said: "With me, means in my abode." And the other Rabbis say from this [it is derived that God forgave his sin], (II Sam. 21, 6.) And we will hang them up unto the Lord in Gibas of Saul, the chosen of the Lord. i.e., A Bath Kol (heavenly voice) went forth and said "The chosen of the Lord."

There are three afflictions, (namely,) the affliction of the fast, the affliction of the prison, and the affliction of the road. Whence do we know of the affliction of the fast? (Because it is said,) "I afflicted my soul with fasting" (Ps. 35:13). Whence do we know of the affliction of the prison? (Because it is said,) "They hurt his feet with fetters" (Ps. 105:18). Whence do we know of the affliction of the road? (Because it is said,) "He weakened my strength in the way" (Ps. 102:23). On account of the affliction of the road, (the children of Israel) did not circumcise, and when they went forth from Egypt all the people were circumcised, both young and old, as it is said, "For all the people that came out were circumcised" || (Josh. 5:5).