Appears 5 times in the Quran. (Root: سعي)
  1. And who is more unjust than he who prevents (men) from the masjids of Allah, that His name should be remembered in them, and strives to ruin them? (As for) these, it was not proper for them that they should have entered them except in fear; they shall meet with disgrace in this world, and they shall have great chastisement in the hereafter.

  2. And when he turn,s back, he runs along in the land that he may cause mischief in it and destroy the tilth and the stock, and Allah does not love mischief-making.

  3. And whoever desires the hereafter and strives for it as he ought to strive and he is a believer; (as for) these, their striving shall surely be accepted.

  4. And that man shall have nothing but what he strives for-

  5. The day on which man shall recollect what he strove after,