Which preposition to use with avers

in Occurrences 3%

" "I thought it would be too wet," he averred in explanation.

to Occurrences 3%

Perhaps I can intimate the extent of their unlikeness by revealing that Mrs. Potts, early in our acquaintance, had observed of me that I was not serious enough; whereas Miss Caroline was presently averring to my face that I was entirely too serious.

with Occurrences 2%

The friends had worked together before; though Neddy reviled Mike for a coward, and Mike averred with curses, that Neddy would bring them both to the gallows some day, yet they worked well together and had a respect for one another, each allowing for the other's idiosyncrasies.

of Occurrences 1%

That which we must aver of every truth discovered or revealed, of every knowledge needful to man and won by man; that which we must affirm as the only rational interpretation of the mysterious suggestions rising below the conscious thoughts of man, and prompting to noblest benedictions on the race; that we must, with deepened awe, say of the holiest truths shown to the human soul,Inspired!

Which preposition to use with  avers