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

“and who keep together what God has bidden to be joined, and stand in awe of their Sustainer and fear the most evil reckoning [which awaits such as do not respond to Him];”

(Such as unite that which Allah hath commanded should be joined) of kinsfolk; it is also said that this means: of the belief in Muhammad (pbuh) and in the Qur'an, (and fear their Lord) and do works for the sake of their Lord, (and dread a woeful reckoning) and fear Allah's severe chastisement.