<!--
{
  "availability" : [
    "iOS: 15.0.0 -",
    "iPadOS: 15.0.0 -",
    "macCatalyst: 15.0.0 -",
    "macOS: 12.0.0 -",
    "tvOS: 15.0.0 -",
    "visionOS: 1.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "GroupActivities",
  "identifier" : "/documentation/GroupActivities/GroupSessionMessenger/MessageContext/source",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Group Activities"
    ],
    "preciseIdentifier" : "s:15GroupActivities0A16SessionMessengerC14MessageContextV6sourceAA11ParticipantVvp"
  },
  "title" : "source"
}
-->

# source

The participant device that sent the message.

```
var source: Participant
```

## Discussion

Each device has a unique participant. Use this property to determine the origin of the message.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)