Sayyiduna Ibn Abbas (may Allah be pleased with them both) used to say concerning the saying of Allah Almighty, "And he certainly saw him on the clear horizon" [Al-Takwir: 23]: "By this I mean Jibril (peace be upon him): that Muhammad (peace and blessings be upon him) saw him in his (true) form at the Sidrat al-Muntaha (the Lote Tree of the Utmost Boundary)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12512