Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:13:21 –

And those who join that which Allah has ordered to be joined and fear their Lord and are afraid of the evil of ˹their˺ account,  

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;
القرآن:١٣:٢١ –

وَالَّذِينَ يَصِلُونَ مَا أَمَرَ اللَّهُ بِهِ أَنْ يُوصَلَ وَيَخْشَوْنَ رَبَّهُمْ وَيَخَافُونَ سُوءَ الْحِسَابِ  

{والذين يصلون ما أمر الله به أن يوصل} من الإيمان والرحم وغير ذلك {ويخشون ربهم} أي وعيده {ويخافون سوء الحساب} تقدم مثله.

See similar narrations below:

Collected by Suyūṭī
suyuti:5420a –
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السيوطي:٥٤٢٠a –

"إِن البِرَّ والصِّلَةَ ليخفِّفانِ سوءَ الحساب يومَ القيامة، ثم تلا رسول الله ﷺ {وَالَّذِينَ يَصِلُونَ مَا أَمَرَ اللَّهُ بِهِ أَنْ يُوصَلَ وَيَخْشَوْنَ رَبَّهُمْ وَيَخَافُونَ سُوءَ الْحِسَابِ} ".  

ابن معروف وابن عساكر والديلمى عنه