"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.
牛津高阶第八版
美国韦氏词典
Dictionary.com
Free Dictionary
维基百科 (自由的百科全书)