Surah Ar-Ra'd 13:21

وَٱلَّذِينَ يَصِلُونَ مَآ أَمَرَ ٱللَّهُ بِهِۦٓ أَن يُوصَلَ وَيَخْشَوْنَ رَبَّهُمْ وَيَخَافُونَ سُوٓءَ ٱلْحِسَابِ

And those who join that which Allāh has ordered to be joined and fear their Lord and are afraid of the evil of [their] account,

Translation: Saheeh International

Tafsir

and such as cement what God has commanded should be cemented of faith and kinship ties and so forth and fear their Lord that is His Threat of punishment and dread an awful reckoning — a similar statement has preceded;

Excerpt from Tafsir al-Jalalayn, commentary on 13:21, via Quran.com. The reader has the full commentary and 9 more tafsirs.