مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3766
The Offices of Commander and Qadi
Cases and Depositions - Section 1
وَعَنْ زَيْدِ بْنِ خَالِدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَلَا أُخْبِرُكُمْ بِخَيْرِ الشُّهَدَاءِ؟ الَّذِي يَأْتِي بشهادتِه قبلَ أنْ يسْأَلهَا» . رَوَاهُ مُسلم
Zaid b. Khalid reported God’s Messenger as saying, “Shall I not tell you of the best witness? He is the one who produces his deposition before he is asked for it.” Muslim transmitted it.
Mishkat al-Masabih, 3766صَحِيحٌ (الألباني)