Final answer:
The Transport Layer of the OSI model ensures message integrity between source and destination by providing error detection and correction.
Step-by-step explanation:
The layer of the OSI model that is concerned with message integrity between source and destination is the Transport Layer. The Transport Layer, which is Layer 4 in the OSI model, is responsible for ensuring that messages are delivered error-free, in sequence, and with no losses or duplications. It provides reliable message transmission, which can be assured through the use of error detection and correction techniques. Integrity checking, such as checksums and error correction codes, helps to ensure that the message received is the same as the message sent, making the Transport Layer essential for maintaining data integrity.