Surah Ash-Sharh 94:7
فَإِذَا فَرَغْتَ فَٱنصَبْ
So when you have finished [your duties], then stand up [for worship].
Translation: Saheeh International
Tafsir
So when you are finished from performing prayer toil exert yourself in supplication to God
Excerpt from Tafsir al-Jalalayn, commentary on 94:7, via Quran.com. The reader has the full commentary and 9 more tafsirs.