"Will he vouch for me?"
"I vouch for the quality of my products"
"He vouched his words by his deeds"
It would be too long to vouch Texts for each particular.
For the truth of this I vouch the mathematicians.
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)