﴿ لَقَدْ رَأَىٰ مِنْ ءَايَٰتِ رَبِّهِ ٱلْكُبْرَىٰٓ ﴾

“truly did he see some of the most profound of his Sustainer’s symbols.”

(Verily he) i.e. Muhammad (pbuh) (saw one of the greater revelations of his Lord) he saw one of the greatest marvels of his Lord.