It has been suggested here that these verses prove that Jesus practiced eisegesis simply because his OT source is not familiar.
Is there a plausible source for his teaching which does not require eisegesis when a known hermeneutic is applied?
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Jesus did not practice eisegesis, despite His inherent authority to do so.
Matt 4:4 says this
But Jesus answered, “It is written: ‘Man shall not live on bread alone, but on every word that comes from the mouth of God.’
This is a direct quotation from Deut 8 -
3 He humbled you, and in your hunger He gave you manna to eat, which neither you nor your fathers had known, so that you might understand that man does not live on bread alone, but on every word that comes from the mouth of the LORD. 4 Your clothing did not wear out and your feet did not swell during these forty years. 5 So know in your heart that just as a man disciplines his son, so the LORD your God disciplines you.
We observe two important things about both passages:
Therefore, Jesus did not practice eisegesis.
To expand on Dottard's answer, Jesus' temptations were temptations about how he would conduct his ministry.
The symbolic character of the narrative is evident; the temptations and Jesus’ answers define the true character of his Messianic mission. The answer of Jesus to all three questions is taken from Dt (8:3; 6:16, 13). The use of this source shows that the Law itself reveals the true character of messiahship. The three temptations can be summed up as temptations to power. The first temptation is to use miraculous power to provide for ordinary material needs.4. The answer of Jesus (Dt 8:3) does not deny that ordinary needs should be met by ordinary means, but subordinates even basic physical necessities to the revealed word of God. Jesus does not fulfill his mission by providing for basic physical necessities, but by proclaiming the word that is life. -- Brown, R. E., Fitzmyer, J. A., & Murphy, R. E. (1996). The Jerome Biblical commentary (Vol. 2, pp. 68–69). Englewood Cliffs, NJ: Prentice-Hall.
John in his gospel, rather than repeat the temptations, expounds on how they continue (John 6).
Here is a cursory look at Ps 105:40,41 to show a plausible source for Jesus's teaching as he used the methods of sensus plenior and pardes to exegete his summary. (addressing the issue of pardes in the referenced post).
Mt 4:4 But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God. Lu 4:4 And Jesus answered him, saying, It is written, That man shall not live by bread alone, but by every word of God.
Ps 105:40 [The people] asked, and he brought quails, and satisfied them with the bread of heaven. 41 He opened the rock, and the waters gushed out; they ran in the dry places [like] a river.
God provided what they asked for (quail), and what they needed (bread and water). The water represents the Word of God, and the bread is his body given on the cross. Since the history of Israel is a parable (De 28:37), we interpret symbols based on the notarikon of the words.
Quail שלו - peace של of him ו; or flockling שו with teaching ל . Bread, war לחם - teaching ל of Egypt (flesh) חם . The cross was the culmination of the war between heaven and earth and Jesus gave himself there. Water מים - creation י surrounded by the father מ (Spirit) and the Son ם (Truth).
Literally (pashat) they did not live by bread alone.
Reference (remez) Jesus was speaking of teaching and and calling on the verse which has symbols of eating and drinking as learning.
Compare (derash) God first provided for their perceived needs; the things they asked for, and gave them their real needs of peace, teaching and true worship; just as he was doing through the life, death and resurrection of Christ.
Hidden (sod) The Quail, bread and water are all symbols of Jesus. "Man does not live by the cross (bread) alone, but by worship in Spirit and Truth (water). "