حَدَّثَنَا يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ مُحَمَّدِ بْنِ عَمْرِو بْنِ حَزْمٍ، عَنْ أَبِيهِ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرِو بْنِ عُثْمَانَ، عَنْ أَبِي عَمْرَةَ الأَنْصَارِيِّ، عَنْ زَيْدِ بْنِ خَالِدٍ الْجُهَنِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ أَلاَ أُخْبِرُكُمْ بِخَيْرِ الشُّهَدَاءِ الَّذِي يَأْتِي بِشَهَادَتِهِ قَبْلَ أَنْ يُسْأَلَهَا أَوْ يُخْبِرُ بِشَهَادَتِهِ قَبْلَ أَنْ يُسْأَلَهَا ‏"‏ ‏.‏

Yahya related to me from Malik from Abdullah ibn Abi Bakr ibnMuhammad ibn Amr ibn Hazm from his father from Abdullah ibn Amr ibnUthman from Abu Amra al-Ansari from Zayd ibn Khalid al-Juhani that theMessenger of Allah, may Allah bless him and grant him peace, said,"Shall I not tell you who is the best of witnesses? The one who bringshis testimony before he is asked for it, or tells his testimony beforehe is asked for it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 36 Hadith 1404
Web Ref:  Muwatta Imam Malik Book 36 Hadith 3