And We had already given Moses and Aaron the criterion and a (21:48)

Almuntakhab Fi Tafsir Alquran Alkarim

And We gave Mussa and Harun the canon imparting the soundness of judgement in the choice of means and ends and in the choice of what is morally good, honest and straight-forward, serving as an illumination and enlightenment besides being a divine light and a constant reminder of Allah to those who entertain the profound reverence dutiful to Him

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(21:48) Before *49 this We bestowed on Moses and Aaron the Criterionand Light and "Admonition" *50 for the betterment of those righteous *51 people,

And We had already given Moses and Aaron the criterion and a meaning

*49) From here begin the stories of the Prophets. If we consider these stories in the context in which they occur, it becomes plain that these have been related to impress the following themes:
(1) All the former Prophets were human beings: therefore there is nothing strange or unusual that a human being like Muhammad has been sent as a Messenger (Allah's peace be upon him).
(2) The Mission and teachings of this Prophet are the same as of those who were sent before him.
(3) All the Prophets had been granted a privileged position by Allah, Who blessed them with special favours. For instance, though they were made to suffer from hardships and persecutions for years, ultimately Allah heard their prayers and helped them in miraculous ways against their enemies and persecutors.
(4) In spite of Allah's special favours on them they were no more than His humble servants and human beings and had no share whatever in Godhead; so much so that sometimes they committed errors of judgment, fell ill, were put to trials and even committed faults, for which they were called to account by Allah.
*50) All the three words have been used in praise of the Torah: (1) A Criterion which distinguished the Truth from falsehood. (2) A Light which showed the Right Way of life, and (3) An Admonition, which reminded the erring descendants of Adam to remember the lesson they had forgotten.
*51) Though it was sent for the good of all human beings, only the pious people, having these characteristics, could benefit from it.
 

And We had already given Moses and Aaron the criterion and a meaning in Urdu

پہلے ہم موسیٰؑ اور ہارونؑ کو فرقان اور روشنی اور "ذکر" عطا کر چکے ہیں اُن متقی لوگوں کی بھَلائی کے لیے