An Early Modern Midrash on Tolerance?

My brother found the following 'modern midrash' in a book he happened across at shul one day, called כל אגדות ישראל ("All the Legends of the Jewish People") by י"ב לבנר; the book describes the lore it contains on its title page as
ערוכות על פי המקורות הראשונים וכתובות בלשון המקרא לפי סדר הזמנים
arranged according to the first sources and written chronologically in biblical hebrew

He found section #1 of 5, and the edition was the 13th — "New Israeli" — printing, published by תושיה in 1956. No idea when it was originally written. It includes aggadot from a wide variety of sources, including in this case — aggada #62 in the book — at least one from מורה נבוכי הזמן by R' Nachman Krochmal.

„מוסר“ שדי
מורה נבוכי הזמן בסה"ס בשל"ק

The Almighty's “Moral Lesson”
Guide for the Perplexed of [Our] Time bsh"s(?) bšl"q(?)

It was in those days, and Avraham was sitting in the doorway of his tent at sunset, and then he saw — behold — an old man, weary and exhausted, was walking along and approaching him. So Avraham got up and ran towards him, and said:

"Please, sir, do not bypass your servant; stay over here tonight, and rest, and then you can wake up early in the morning and continue on your way in peace."

And then the old man answered Avraham, saying:

"No thanks, I'll stay here under the tree."

But then Avraham urged him greatly, and so the old man turned aside to his tent.

Then Avraham took butter and milk, and put them before him; and he baked leavenless bread — and the old man ate and was satisfied.

And so it was after he ate and drank, that then Avraham told him:

"Please, sir, bless the God of the Heavens and the Earth, who gives food to all bodies!"

But the old man said:

"I do not know your god, and I will not bless any other than my own god(s) who I made with my own fingers!"

And then Avraham continued speaking to the old man, and told him about the kind acts of God, and God's greatness and might; and he explained to him the empty nature of idols, which give no benefit and do not save those who trust in them. And he spoke to his heart, attempting to convince him to believe in God and to thank God for the acts of kindness that God performs every day.

And so the old man listened to Avraham's words, and said:

"What problem is there between you and me, that you come to turn me aside from following my god(s)? Leave me alone — for I will not listen to your words that you say to me!"

And then Avraham became enraged with the old man, and said:

"Get out of my house this instant!"

And so the old man hurried and left the house, and walked out into the wilderness during the dark of night. And the incident was very evil in the eyes of God, on behalf of the old man, and God appeared to Avraham, and said:

"Where is the man who came to you tonight?"

And so Avraham answered, saying:

"The old man was very difficult; I spoke to his heart, attempting to convince him to believe in you, God, so that it would be good for him for all time, but he did not want to listen to me. And so he got me very angry, and embittered me, and then I kicked him out of my house...!"

And then God said:

"Did you pay attention to what you did?... See, please, see — behold, I have been willfully overlooking that old man's sins many many years already; and I clothed him, and supported him, and considered all his lacks my responsibility — and he came to you tonight, and you troubled yourself to feed him; but then you forgot your mercy in anger, and kicked him out of your presence!!"

And so Avraham pleaded to God, saying:

"Please, God, forgive me this time and pass my sin away!"

But God then said:

"I will not forgive you until and unless you humble yourself before the old man who you harmed, and he forgives your transgression!"

And so then Avraham hurried and ran into the wilderness, and searched for the man, and found him, and then he fell before his feet and cried, and pleaded with him, saying:

"Please, forgive my sin which I committed against you!"

And then the old man listened to the voice of Avraham's supplications, and said:

"I have forgiven, according to your words."

And Avraham did not loosen himself from the old man until he had brought him back to his house, fed him and gave him to drink, and did much good for him; and then he gave him provisions for the way.

And then the word of God came to Avraham once again, saying:

"Since you have now done that which is right in my eyes, I will also remember my contract for your descendents after you — although when they will sin, I will punish them with a human rod, I will never remove my contract with them forever!"

Interesting.