diff --git a/src/Illuminate/Database/Eloquent/Builder.php b/src/Illuminate/Database/Eloquent/Builder.php
index 02a5d60eef16..ba5a678b81e4 100755
--- a/src/Illuminate/Database/Eloquent/Builder.php
+++ b/src/Illuminate/Database/Eloquent/Builder.php
@@ -582,7 +582,7 @@ public function createOrFirst(array $attributes = [], array $values = [])
         try {
             return $this->withSavepointIfNeeded(fn () => $this->create(array_merge($attributes, $values)));
         } catch (UniqueConstraintViolationException) {
-            return $this->useWritePdo()->where($attributes)->first();
+            return $this->useWritePdo()->where($attributes)->firstOrFail();
         }
     }
 
diff --git a/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php b/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php
index b2e494478211..7338bae4f313 100755
--- a/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php
+++ b/src/Illuminate/Database/Eloquent/Relations/BelongsToMany.php
@@ -653,11 +653,11 @@ public function createOrFirst(array $attributes = [], array $values = [], array
         }
 
         try {
-            return tap($this->related->where($attributes)->first(), function ($instance) use ($joining, $touch) {
+            return tap($this->related->where($attributes)->firstOrFail(), function ($instance) use ($joining, $touch) {
                 $this->getQuery()->withSavepointIfNeeded(fn () => $this->attach($instance, $joining, $touch));
             });
         } catch (UniqueConstraintViolationException) {
-            return (clone $this)->useWritePdo()->where($attributes)->first();
+            return (clone $this)->useWritePdo()->where($attributes)->firstOrFail();
         }
     }
 
diff --git a/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php b/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php
index c748dd7c644d..6e82a82d425c 100755
--- a/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php
+++ b/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php
@@ -254,7 +254,7 @@ public function createOrFirst(array $attributes = [], array $values = [])
         try {
             return $this->getQuery()->withSavepointIfNeeded(fn () => $this->create(array_merge($attributes, $values)));
         } catch (UniqueConstraintViolationException) {
-            return $this->useWritePdo()->where($attributes)->first();
+            return $this->useWritePdo()->where($attributes)->firstOrFail();
         }
     }
 
diff --git a/tests/Database/DatabaseEloquentHasManyTest.php b/tests/Database/DatabaseEloquentHasManyTest.php
index b184dfdd14c4..ed6aa5a0feab 100755
--- a/tests/Database/DatabaseEloquentHasManyTest.php
+++ b/tests/Database/DatabaseEloquentHasManyTest.php
@@ -188,7 +188,7 @@ public function testCreateOrFirstMethodWithValuesFindsFirstModel()
         });
         $relation->getQuery()->shouldReceive('useWritePdo')->once()->andReturn($relation->getQuery());
         $relation->getQuery()->shouldReceive('where')->once()->with(['foo' => 'bar'])->andReturn($relation->getQuery());
-        $relation->getQuery()->shouldReceive('first')->once()->with()->andReturn($model = m::mock(stdClass::class));
+        $relation->getQuery()->shouldReceive('firstOrFail')->once()->with()->andReturn($model = m::mock(stdClass::class));
 
         $this->assertInstanceOf(stdClass::class, $found = $relation->createOrFirst(['foo' => 'bar'], ['baz' => 'qux']));
         $this->assertSame($model, $found);
diff --git a/tests/Database/DatabaseEloquentMorphTest.php b/tests/Database/DatabaseEloquentMorphTest.php
index 4870284090f2..2d70682c52c8 100755
--- a/tests/Database/DatabaseEloquentMorphTest.php
+++ b/tests/Database/DatabaseEloquentMorphTest.php
@@ -234,7 +234,7 @@ public function testCreateOrFirstMethodFindsFirstModel()
         });
         $relation->getQuery()->shouldReceive('useWritePdo')->once()->andReturn($relation->getQuery());
         $relation->getQuery()->shouldReceive('where')->once()->with(['foo'])->andReturn($relation->getQuery());
-        $relation->getQuery()->shouldReceive('first')->once()->with()->andReturn($model = m::mock(Model::class));
+        $relation->getQuery()->shouldReceive('firstOrFail')->once()->with()->andReturn($model = m::mock(Model::class));
 
         $this->assertInstanceOf(Model::class, $relation->createOrFirst(['foo']));
     }
@@ -255,7 +255,7 @@ public function testCreateOrFirstMethodWithValuesFindsFirstModel()
         });
         $relation->getQuery()->shouldReceive('useWritePdo')->once()->andReturn($relation->getQuery());
         $relation->getQuery()->shouldReceive('where')->once()->with(['foo' => 'bar'])->andReturn($relation->getQuery());
-        $relation->getQuery()->shouldReceive('first')->once()->with()->andReturn($model = m::mock(Model::class));
+        $relation->getQuery()->shouldReceive('firstOrFail')->once()->with()->andReturn($model = m::mock(Model::class));
 
         $this->assertInstanceOf(Model::class, $relation->createOrFirst(['foo' => 'bar'], ['baz' => 'qux']));
     }