القصاص من القاتل
legal retribution on the murderer/ penalty of retribution on the murderer

in this legel context "قصاص" is better translated as ''legal retribution'':

https://www.almaany.com/quran/2/179/3/

or ''penalty of retribution'' as in:

(d) In 5 cases, enforcement of the penalty of retribution (qisas) was waived by the aggrieved parties;

(د) 5 أحكام تم التنازل فيها عن تنفيذ القصاص من قبل أولياء الدم؛
https://context.reverso.net/translation/arabic-english/القصا...

''قاتل'': murderer

https://www.arabdict.com/de/english-arabic/murderer

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Note added at 1 hr (2019-06-23 08:30:44 GMT)
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''صك '' : instrument

examples:
The Court classified the instruments as “multipartite law-making treaties”.وصنفت المحكمة الصكين في عداد 'المعاهدات الشارعة المتعددة الأطراف`.
That balance would be determined by such important characteristics as the tribunal's founding instrument, jurisdiction, applicable law, location, composition and financial arrangements.وهذا التوازن ستقرره خصائص هامة من قبيل صك تأسيس المحكمة، واختصاصها، والقانون المنطبق، ومكانها، وتكوينها، والترتيبات المالية.

https://www.arabdict.com/de/english-arabic/صك المحكمة



https://glosbe.com/en/ar/instrument

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Note added at 5 hrs (2019-06-23 11:58:12 GMT)
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''Retribution'' implies justice

I dedicate this song to you and all my fellow syrians..............


Rise like a phoenix
Out of the ashes seeking rather than vengeance
Retribution you were warned
Once I'm transformed
Once I'm reborn
You know I will rise like a phoenix
But you're my flame

https://www.youtube.com/watch?v=W62JHOddvrU