HAKIM 316:
from Muṣʿab b. Saʿd from his father —
[Machine] The Messenger of Allah ﷺ said as follows: "Then we looked and found Khalid bin Makhlad to be more steadfast, cautious, and trustworthy than Bakr bin Bakkir, so we appointed him to the extra task." This hadith was narrated by Abdullah bin Abdul-Qudus, transmitted by Al-A'mash with another chain of narration.
الحاكم ٣١٦:
عن مصعب بن سعد عن أبيه —
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ نَحْوَهُ «ثُمَّ نَظَرْنَا فَوَجَدْنَا خَالِدَ بْنَ مَخْلَدٍ أَثْبَتَ وَأَحْفَظَ وَأَوْثَقَ مِنْ بَكْرِ بْنِ بَكَّارٍ فَحَكَمْنَا لَهُ بِالزِّيَادَةِ» وَقَدْ رَوَاهُ عَبْدُ اللَّهِ بْنُ عَبْدِ الْقُدُّوسِ عَنِ الْأَعْمَشِ بِإِسْنَادٍ آخَرَعلى شرطهما