Wiktionary
parties of the first part
n. (party of the first part English)
Usage examples of "parties of the first part".
That is to say, interested in a joint assassination, the parties of the first part unable to participate actively, due to the sensitive nature of their high official positions, is that about it?
The snag in this business of falling in love, aged relative, is that the parties of the first part so often get mixed up with the wrong parties of the second part, robbed of their cooler judgment by the parties of the second part's glamour.
I mean to say, I bet you got your lawyer to write him a letter full of whereases, peradventures, and parties of the first part, and so forth.