【形式ばった表現】 bear witness to something
（＝立証）proof; evidence; testimony; witness; demonstration:（=する） to prove （a fact）; to demonstrate （a theory）; to establish （one's innocence）; to substantiate, make good （one's statement）; to seal （one's devotion）:（無意志なら）to prove, be proof of, be evidence of, witness, bear witness to, testify to, show, bespeak, argue （a fact）; to bear out, support, corroborate, confirm （one's statement）
This fact serves to bear out my statement―support my statement―corroborate my assertion―confirm my assertion.
The fact shows his innocence―shows that he is innocent―proves his innocence―is proof of his innocence―is proof that he is innocent―is evidence of his innocence―witnesses his innocence―bears witness to his innocence―testifies to his innocence.
Here are some documents proving my assertion―in proof of my assertion―that bear out my statement―that support my statement.
Here are some facts proving his innocence―in proof of his innocence―in evidence of his innocence―in witness of his innocence.
The numbers of vacant houses show―witness―bear witness to―testify to―the badness of the times.
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I'll prove it - Weblio Email例文集
a geometric proof - 研究社 新英和中辞典
to testify - EDR日英対訳辞書