"The best of witnesses is the one who gives his testimony before being asked for it."
Jami` at-Tirmidhi Book 35, Hadith 3
← Previous Hadith Ibn Abi 'Amrah."

Jami` at-Tirmidhi Book 35, Hadith 2 Next Hadith → The testimony of a treacherous man is not acceptable nor a treacherous woman nor a man lashed for the Hadd nor a woman lashed nor one possessing malice of enmity nor a rehearsed witness nor the Qani of (one contracted by)the family on their behalf nor the one associating himself to other than his Wala or to other than his relatives."

Jami` at-Tirmidhi Book 35, Hadith 4