Wassama-i thati arrajAA (surah Tariq: 11)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(86:11) By the heaven with its recurring cycle of rain, *6

Wassamaaa`i zaatir raj

*6) The words dhat ar-raj`e have been used for the sky. Literally raj`e means to return, but metaphorically this word is used for the rain in Arabic, for rain does not fall just once, but returns over and over again in the season and of season as well. Another reason for calling the rain raj `e is that vapour from the oceans of the earth and then falls back as rain on the sometimes out water rises as the same earth.