Surah Al-Balad 90:17

ثُمَّ كَانَ مِنَ ٱلَّذِينَ ءَامَنُوا۟ وَتَوَاصَوْا۟ بِٱلصَّبْرِ وَتَوَاصَوْا۟ بِٱلْمَرْحَمَةِ

And then being among those who believed and advised one another to patience and advised one another to compassion.

Translation: Saheeh International

Tafsir

while being thumma kāna is a supplement to iqtahama ‘he assaulted’; thumma is for the ordering of things to be mentioned in other words what is meant is that at the point of the assault he was one of those who believe and enjoin one another to steadfastness in pursuing obedience and in refraining from disobedience and …

Excerpt from Tafsir al-Jalalayn, commentary on 90:17, via Quran.com. The reader has the full commentary and 9 more tafsirs.