Quran Ayat regarding Sometimes stand up in Prayer two-thirds of the night-1

20.Verily, your Lord knows that you remain standing in devotion nearly two-thirds of the night, and sometimes half of it, and sometimes a third of it, along with a party of your Companions [29] with you. And Allah measures [30] the night and the day. He knows that you [31] are not able to calculate it. So He has turned to you (mercifully). Therefore, recite [32] how much is easy out of the Quran. He knows that some of you will fall ill [33], and others will travel in the land seeking the Bounty of Allah, and others will fight [34] in the Path of Allah. Therefore, recite [35] as much of it as is easy (for you) and keep up Salaah and pay the Zakaah [36] and offer to Allah a good loan [37]. And whatever of good you send beforehand [38] for yourselves, you will find it with Allah, better and greater in reward. Certainly, Allah is Most Forgiving, Ever Merciful [39].