diff --git a/core/modules/migrate/src/Plugin/Migration.php b/core/modules/migrate/src/Plugin/Migration.php
index 01a09a184e3215af5df0b58f697bd9d4315bb910..f19a35e3e5fcbc63f6f7c7153a91d9fbc60e14fb 100644
--- a/core/modules/migrate/src/Plugin/Migration.php
+++ b/core/modules/migrate/src/Plugin/Migration.php
@@ -112,13 +112,6 @@ class Migration extends PluginBase implements MigrationInterface, RequirementsIn
    */
   protected $label;
 
-  /**
-   * The plugin ID for the row.
-   *
-   * @var string
-   */
-  protected $row;
-
   /**
    * The source configuration, with at least a 'plugin' key.
    *
@@ -184,16 +177,6 @@ class Migration extends PluginBase implements MigrationInterface, RequirementsIn
    */
   protected $idMapPlugin;
 
-  /**
-   * The source identifiers.
-   *
-   * An array of source identifiers: the keys are the name of the properties,
-   * the values are dependent on the ID map plugin.
-   *
-   * @var array
-   */
-  protected $sourceIds = [];
-
   /**
    * The destination identifiers.
    *