Mishkat al-Masabih 2176
Khālid b. Ma'dān said:
Recite the rescuer, which is A.L.M. The sending down (Qur’ān, 32) for I have heard that a man who had committed many sins used to recite it and nothing else. It spread its wing over him and said, “My Lord, forgive him, for he often used to recite me so the Lord most high made it an intercessor for him and said, “Record for him a good deed and raise him a degree in place of every sin.” Khālid said also: It will dispute on behalf of the one who recites it when he is in his grave saying, “O God, if I am a part of Thy Book, make me an intercessor for him; but if I am not a part of Thy Book, blot me out of it.” It will be like a bird putting its wing on him, it will intercede for him and will protect him from the punishment in the grave. He said the same about “Blessed is He.” (Qur’ān, 67) Khālid did not go to sleep at night till he had recited them. Tā’ūs said they were given sixty virtues more than any other sūra in the Qur’ān. 

Dārimī transmitted it.
وَعَن خَالِد بن معدان قَالَ: اقرؤوا المنجية وَهِي (آلم تَنْزِيل)
فَإِن بَلَغَنِي أَنَّ رَجُلًا كَانَ يَقْرَؤُهَا مَا يَقْرَأُ شَيْئًا غَيْرَهَا وَكَانَ كَثِيرَ الْخَطَايَا فَنَشَرَتْ جَنَاحَهَا عَلَيْهِ قَالَتْ: رَبِّ اغْفِرْ لَهُ فَإِنَّهُ كَانَ يُكْثِرُ قِرَاءَتِي فَشَفَّعَهَا الرَّبُّ تَعَالَى فِيهِ وَقَالَ: اكْتُبُوا لَهُ بِكُلِّ خَطِيئَةٍ حَسَنَةٍ وَارْفَعُوا لَهُ دَرَجَةً ". وَقَالَ أَيْضًا: " إِنَّهَا تُجَادِلُ عَنْ صَاحِبِهَا فِي الْقَبْرِ تَقُولُ: اللَّهُمَّ إِنْ كُنْتُ مِنْ كِتَابِكَ فَشَفِّعْنِي فِيهِ وَإِنْ لَمْ أَكُنْ مِنْ كِتَابِكَ فَامْحُنِي عَنْهُ وَإِنَّهَا تَكُونُ كَالطَّيْرِ تَجْعَلُ جَنَاحَهَا عَلَيْهِ فَتَشْفَعُ لَهُ فَتَمْنَعُهُ مِنْ عَذَابِ الْقَبْر " وَقَالَ فِي (تبَارك)
مثله. وَكَانَ خَالِد لَا يَبِيتُ حَتَّى يَقْرَأَهُمَا. وَقَالَ طَاوُوسُ: فُضِّلَتَا عَلَى كُلِّ سُورَةٍ فِي الْقُرْآنِ بِسِتِّينَ حَسَنَةً. رَوَاهُ الدَّارمِيّ