What will be the first act inquired about or decided on on the Day of Judgment? A hadith related by ‘Abdullah b. Mas‘ud (d. 32-33/653) says:
قال النبي صلى الله عليه وسلم: «أول ما يقضى بين الناس بالدماء»
The Prophet (ﷺ) said, “The cases which will be decided first (on the Day of Resurrection) will be the cases of blood-shedding.”
Another well-known hadith, on the other hand, has that Abu Huraira reported:
سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: ” إِنَّ أَوَّلَ مَا يُحَاسَبُ بِهِ العَبْدُ يَوْمَ القِيَامَةِ مِنْ عَمَلِهِ صَلَاتُهُ
I heard the Messenger of Allah (ﷺ) say: “The first of his deeds for which a man will be taken into account on the day of resurrection will be his prayer.”
So which is it, prayers or murder/ homicide? And is it not a case of contradiction between hadith narrations? There is no contradiction, and the two things mentioned are first in their respective categories; prayers (salah) will be the first of Allah’s exclusive rights (huquq Allah) that a person will be asked about, whereas bloodshed or homicide will be the first of the people’s mutual rights (huquq al-‘Ibad) to be decided. Not only was this mentioned by many scholars over time, but it is also reported together in a single hadith.
‘Abdullah b. Mas’ud related:
قال رسول الله صلى الله عليه وسلم: «أول ما يحاسب به العبد الصلاة، وأول ما يقضى بين الناس في الدماء»
“The Messenger of Allah (ﷺ) said: “The first thing concerning which a person will be brought to account will be the prayers, and the first thing concerning which scores will be settled among the people, will be bloodshed.”
The above also serves as an example of putting together different narrations of hadith reports to resolve an apparent contradiction.
 Al-Bukhari, al-Sahih, Hadith 6533, 6864
 Al-Tirmidhi, al-Jami‘, Hadith 413; Abu Dawud, al-Sunan, Hadith 864; graded as hasan gharib by al-Tirmidhi and sahih by al-Albani
 Al-Nawawi, Yahya b. Zakariyya, al-Minhaj Sharh Sahih Muslim b. al-Hajjaj, (Beirut: Dar Ihya’ al-Turath al-‘Arabi, 1392 AH) Vol.11, 167; al-‘Asqalani, Ibn Hajar, Fath al-Bari Sharh Sahih al-Bukhari, (Beirut: Dar al-Ma‘rifa, 1379 AH) Vol. 11, 396
 Al-Nasa’i, al-Sunan, Hadith 3991;graded as sahih by al-Albani