diff --git a/.rubocop_ruby.yml b/.rubocop_ruby.yml
index fe783a56..69d23584 100644
--- a/.rubocop_ruby.yml
+++ b/.rubocop_ruby.yml
@@ -71,11 +71,6 @@ AllCops:
   # Otherwise we fallback to the oldest officially supported Ruby version (2.0).
   TargetRubyVersion: 3.0
 
-  RSpec:
-    Patterns:
-      - "(?:^|/)spec/"
-      - "(?:^|/)test/"
-
 # Indent private/protected/public as deep as method definitions
 Layout/AccessModifierIndentation:
   EnforcedStyle: indent
diff --git a/app/models/decidim/action_delegator/delegation.rb b/app/models/decidim/action_delegator/delegation.rb
index a195a9a7..fddb98db 100644
--- a/app/models/decidim/action_delegator/delegation.rb
+++ b/app/models/decidim/action_delegator/delegation.rb
@@ -16,6 +16,10 @@ class Delegation < ApplicationRecord
         message: I18n.t("delegations.create.error_granter_unique", scope: "decidim.action_delegator.admin")
       }
 
+      validate :grantee_is_not_granter
+      validate :granter_and_grantee_belongs_to_same_organization
+      validate :granter_is_same_organization_as_consultation
+
       delegate :consultation, to: :setting
 
       before_destroy { |record| throw(:abort) if record.grantee_voted? }
@@ -32,6 +36,27 @@ def grantee_voted?
           granter_votes&.detect { |vote| vote.versions.exists?(whodunnit: grantee&.id) } ? true : false
         end
       end
+
+      private
+
+      def grantee_is_not_granter
+        return unless granter == grantee
+
+        errors.add(:grantee, :invalid)
+      end
+
+      def granter_and_grantee_belongs_to_same_organization
+        return unless granter.organization != grantee.organization
+
+        errors.add(:grantee, :invalid)
+      end
+
+      def granter_is_same_organization_as_consultation
+        return unless setting && setting.consultation
+        return unless consultation.organization != granter.organization
+
+        errors.add(:granter, :invalid)
+      end
     end
   end
 end
diff --git a/spec/models/decidim/action_delegator/delegation_spec.rb b/spec/models/decidim/action_delegator/delegation_spec.rb
index f22e1c8f..97cd6fd6 100644
--- a/spec/models/decidim/action_delegator/delegation_spec.rb
+++ b/spec/models/decidim/action_delegator/delegation_spec.rb
@@ -11,6 +11,25 @@ module ActionDelegator
       it { is_expected.to be_valid }
       it { is_expected.not_to be_grantee_voted }
 
+      context "when users from different organizations" do
+        let(:grantee) { create(:user) }
+
+        subject { build(:delegation, grantee: grantee) }
+
+        it { is_expected.not_to be_valid }
+      end
+
+      context "when users are from a different organization than the consultation" do
+        let(:consultation) { create(:consultation) }
+        let(:setting) { create(:setting, consultation: consultation) }
+        let(:grantee) { create(:user) }
+        let(:granter) { create(:user, organization: grantee.organization) }
+
+        subject { build(:delegation, grantee: grantee, granter: granter, setting: setting) }
+
+        it { is_expected.not_to be_valid }
+      end
+
       describe ".granted_to?" do
         subject { delegation }