It is narrated from Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) that he said: "The Messenger of Allah (peace and blessings be upon him) ordered me to judge between my people. I said: 'I do not know how to judge well.' He (peace and blessings be upon him) said: 'Judge between them, for Allah Almighty is with the judge as long as he does not deliberately act unjustly.'"
This hadith is narrated from Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) only with this chain; Ibrahim al-Sa'igh (may Allah have mercy on him) is alone in narrating it.
And Abu Khalid al-Dabbi, from whom Ibrahim al-Sa'igh (may Allah have mercy on him) narrated this hadith, is Muhammad bin Khalid al-Dabbi (may Allah have mercy on him), and Abu Dawud is Nufay' bin al-Harith (may Allah have mercy on him).
Hadith Referenceالمعجم الأوسط / باب الميم / 6508
Hadith Takhrij«أخرجه الحاكم فى «المستدرك» برقم: 6531، وأحمد فى «مسنده» برقم: 20631، والطبراني فى «الكبير» برقم: 539، 540»