“I was with Abu-Bakr Ibn Mujahid when Hadrat Shibli came. Abu Bakr Ibn Mujahid stood for him(welcomed him) and embraced Hadrat Shibli and kissed him between his eyes. I said to him: “O my Master! Are you doing this to Shibli and you and everyone in Baghdad think of him as a madman.”
He said to me: “I treated him the way I saw Messenger of Allah (sallAllaho alaihi wa ala alihi wa sallam) do and that is, I saw Beloved Prophet(SallaAllaho alaihi wa ala alihi wa sallam) in my dream and he welcomed Shibli, he stood for him and kissed him between his eyes. I asked : “Ya RasulAllah (sallAllaho alaihi wa ala alihi wa sallam), are you treating him like this(People consider him a madman!)?” Prophet (sallAllaho alaihi wa ala alihi wa sallam) answered: “He recites after every prayer, لقد جاءكم until the end of the Surah (Surah Taubah, Verses 128-129).”
In one narration, it is cited that after every obligatory prayer he recites لقد جاءكم until the end of Surah and then recites three times: صلى الله عليك يا محمد
He (Abu bakr) said: When Hadrat Shibli visited him, I asked him about what he recites after every prayer and he mentioned like this.
-Ibn Qayyim (Jala’ul Afham fi Fadli’ Salat Wasalam Ala Muhammad Khairal Anaam,pg 329)