Step 1: Understanding the Concept:
The question provides a formal definition of a contract and asks to identify the jurist or legal authority associated with it. This definition encapsulates the key elements of a contract: agreement, intention to create legal relations, offer, and acceptance.
Step 2: Detailed Explanation:
This specific and comprehensive definition of a contract is found in the authoritative legal treatise, Halsbury's Laws of England. It is a classic common law definition that breaks down the formation of a contract into its essential components:
\begin{itemize}
\item An agreement between two or more persons.
\item The intention for that agreement to be legally enforceable.
\item The mechanism of formation: offer and acceptance.
\end{itemize}
Other jurists have provided different definitions:
\begin{itemize}
\item Salmond: "A contract is an agreement creating and defining obligations between the parties."
\item Pollock: "Every agreement and promise enforceable at law is a contract."
\end{itemize}
The definition provided in the question is most closely and famously associated with Halsbury.
Step 3: Final Answer:
The statement is from Halsbury.