يَوْمَ تَرَى ٱلْمُؤْمِنِينَ وَٱلْمُؤْمِنَـٰتِ يَسْعَىٰ نُورُهُم بَيْنَ أَيْدِيهِمْ وَبِأَيْمَـٰنِهِم بُشْرَىٰكُمُ ٱلْيَوْمَ جَنَّـٰتٌ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَـٰرُ خَـٰلِدِينَ فِيهَا ۚ ذَٰلِكَ هُوَ ٱلْفَوْزُ ٱلْعَظِيمُ Qur’an Al-Hadid (57:12)Yawma tara almumineena waalmuminati yasAAa nooruhum bayna aydeehim wabiaymanihim bushrakumu alyawma jannatun tajree min tahtiha alanharu khalideena feeha thalika huwa alfawzu alAAatheemu
See note [25] on the expression ashab al-yamin ("those on the right hand") in 74:39 . In many instances, the metaphor of "the right hand" or "right side" is used in the Qur'an to denote "righteousness" and, therefore, "blessedness", symbolized in the present context by the "light spreading rapidly" before and on the right side of the believers as a result of their "cognition of God, and their high morality, and their freedom from ignorance and blameworthy traits" (Razi).
In the Darkness of the Day of Judgment there will be a Light to guide the righteous to their Destination. This will be the Light of their Faith and their Good Works. Perhaps the Light of the Right Hand mentioned here is the Light of their Good Works: for the Blessed will receive their Record in their right hand (lxix. 19-24).
The highest Achievement, the highest felicity, the attainment of Salvation, the fulfilment of all desires. See n. 4733 to xliv. 57.