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.
bayhaqi:15867

[Machine] Narrated by the Prophet ﷺ , "By Allah, the world and everything in it is more insignificant to Allah than the wrongful killing of a believer. This is attributed to Yazid ibn Ziyad (or Ibn Abi Ziyad) Al-Shami, who is known for fabricating hadith. However, the first part of the narration has been reported from another perspective, attributed to Al-Zuhri, through a reliable chain of narrators."  

البيهقي:١٥٨٦٧وَبِهَذَا الْإِسْنَادِ

عَنِ النَّبِيِّ ﷺ قَالَ وَاللهِ لَلدُّنْيَا وَمَا فِيهَا أَهْوَنُ عَلَى اللهِ مِنْ قَتْلِ مُؤْمِنٍ بِغَيْرِ حَقٍّ يَزِيدُ بْنُ زِيَادٍ وَقِيلَ ابْنُ أَبِي زِيَادٍ الشَّامِيُّ مُنْكَرُ الْحَدِيثِ وَقَدْ رُوِيَ الْمَتْنُ الْأَوَّلُ مِنْ وَجْهٍ آخَرَ عَنِ الزُّهْرِيِّ مُرْسَلًا