21يا أَيُّهَا النّاسُ اعبُدوا رَبَّكُمُ الَّذي خَلَقَكُم وَالَّذينَ مِن قَبلِكُم لَعَلَّكُم تَتَّقونَJ. M. RodwellO men of Mecca1 adore your Lord, who hath created you and those who were before you: haply ye will fear HimThe people of Medina are generally addressed with "O ye who believe;" the Meccans, with "O men." Hence it has been inferred that from verse 19 (O men) to 37 inclusively, is of the Meccan period. The subjects treated of also lead to this conclusion.