expression
Formal or literary expression used to introduce a concluding statement, action, or declaration based on what precedes. Often found in speeches, official documents, and formal writing.
以上をもちまして、本日の会議を終了いたします。
With this, we conclude today's meeting.
これを以て、私の挨拶とさせていただきます。
Allow me to conclude my remarks with this.
Compound of これ (this) + を (object marker) + 以て (instrumental/comitative particle meaning 'with'). The phrase literally means 'with this' and has been used in formal Japanese for centuries.