Jonathan Isaiah 6:9
5 Then said I, Woe is me, for I have sinned, for I am a guilty man to reprove, and I dwell in the midst of a people polluted with sin: for mine eyes have seen the glory of the Shekinah of the King of the worlds, the Lord of hosts. 6 Then flew one of the ministers unto me, and in his mouth was a word, which he received from the Shekinah of Him who sat upon the throne of glory in the highest heavens, above the altar. 7 And he placed it in my mouth, and said, Behold, I have put the words of my prophecies in thy mouth, and thy iniquities are put away, and thy sins are expiated. 8 And I heard the voice of the Word of the Lord, which said, Whom shall I send to prophesy? and who will go to teach? Then said I, Here am I, send me. 9 And He said, Go, and tell this people, who are diligently hearing, but understand not, and see diligently, but know not. 10 Make the heart of this people fat, and make their ears heavy, and darken their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and repent, and it shall be forgiven them.
Mark 4:11
10 When he was alone, those around him with the Twelve asked him about the parables. 11 He said to them, “The secret of the kingdom of God has been given to you. But to those outside, everything is in parables, 12 “so that although they look they may look but not see,and although they hear they may hear but not understand,so they may not repent and be forgiven.” 13 He said to them, “Don’t you understand this parable? Then how will you understand any parable? 14 The sower sows the word. 15 These are the ones on the path where the word is sown: Whenever they hear, immediately Satan comes and snatches the word that was sown in them. 16 These are the ones sown on rocky ground: As soon as they hear the word, they receive it with joy. 17 But they have no root in themselves and do not endure. Then, when trouble or persecution comes because of the word, immediately they fall away.
Notes and References
"... Targumim may therefore enable us to find materials that are useful in comparison with the Gospels and the rest of the New Testament. In a scholarly age when comparison based on social models has become common, the Targumim provide insights into the treatment of Scripture among ordinary Jews. Another example illustrates an instance in which Jesus appears to have cited a form of Scripture that is closer to the Targum than to any other extant source. In such cases, an awareness that he does so helps us to understand his preaching better than the general similarity between Luke and Pseudo-Jonathan illustrates. Targum of Isaiah 6:9, 10 is an especially famous instance, and it helps to explain Mark 4:11, 12. The statement in Mark could be taken to mean that Jesus told parables with the express purpose “that” (Greek: hina) people might see and not perceive, hear and not understand, lest they turn and be forgiven ..."
Flesher, Paul V. M. & Chilton, Bruce The Targums: A Critical Introduction (pp. 387-388) Brill, 2011