solemnly promise

See: assure
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References in classic literature ?
On the other hand, if they are not in time, I solemnly promise that it will all come right in the end.
A stage or two further on, the lamps were lighted, and a great to-do occasioned by the taking up, at a roadside inn, of a very fastidious lady with an infinite variety of cloaks and small parcels, who loudly lamented, for the behoof of the outsides, the non-arrival of her own carriage which was to have taken her on, and made the guard solemnly promise to stop every green chariot he saw coming; which, as it was a dark night and he was sitting with his face the other way, that officer undertook, with many fervent asseverations, to do.
Whatever evils may befall you, they will not be occasioned by my instrumentality, that I solemnly promise you.
Well, I will tell you, if you solemnly promise to tell everybody else.
Wragge solemnly promises not to lose her shoe next time.
He assured 'we solemnly promise to do all that is necessary at this end in terms of security , good hotels and we want you to tell us the preferences of in terms of food and other things :
He said: "To all of you, I solemnly promise that France will do everything to destroy the army of fanatics who committed these crimes.
To all of you I solemnly promise that France will do everything to destroy the fanatics who did this," the French leader declared.
I solemnly promise you all that France will do everything to defeat the army of fanatics who have committed these crimes, that she will act tirelessly to protect her children," he said.
Now, according to Kara Swisher at Re/code, she has made all her top people solemnly promise that they will stick with the company for three to five years.
Let's raise our right hands and solemnly promise to stop listening to Ontario's free-lunch politicians next time around.
Addressing the maiden cabinet meeting, the Prime Minister stressed that they would have to solemnly promise for sacrificing everything for the national cause.