Under the commentary of Koran 33:43 in Ma'ariful Quran, Mufti Muhammad Shafi has cited a narration that states the following:-
Sayydina Ibn ‘Abbas (may Allah be pleased with him) has stated that Salah from Allah is a blessing, from angels it is prayer for forgiveness and from humans it is supplication. The word Salah carries all the three meanings. (Commentary of Glorious Koran 33:43, Ma'ariful Quran; Web Source: http://www.islamicstudies.info/quran/maarif/maarif.php?sura=33&verse=41)
My main question is: From what Hadith book did Mufti Muhammad Shafi took this narration? What is the authenticity of this narration?