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I.e., on the occasion of his mystic experience of the "Ascension" (mi'raj). Explaining the vision conveyed in the expression sidrat al-muntaha, Raghib suggests that owing to the abundance of its leafy shade, the sidr or sidrah (the Arabian lote-tree) appears in the Qur'an as well as in the Traditions relating to the Ascension as a symbol of the "shade - i.e., the spiritual peace and fulfilment - of paradise. One may assume that the qualifying term al-muntaha ("of the utmost [or "farthest"] limit") is indicative of the fact that God has set a definite limit to all knowledge accessible to created beings, as pointed out in the Nihayah: implying, in particular, that human knowledge, though potentially vast and penetrating, can never - not even in paradise (the "garden of promise" mentioned in the next verse) - attain to an understanding of the ultimate reality, which the Creator has reserved for Himself (cf. note [6] above).
For the Lote-tree in its literal meaning, see n. 3814 to xxxiv. 16. The wild Lote is thorny; under cultivation it yields good fruit and shade, and is symbolic of heavenly bliss, as here and in lvi. 28.