Bhishma said The Kshatriya, O delighter of the Kurus can take two wives. The Kshatriya may take a third wife from the Shudra caste. Such practice prevails, it is true, but it is not sanctioned by the scriptures.
भीष्म उवाच क्षत्रियस्यापि भर्ये द्वे विहिते कुरुनन्दन। तृतीया च भवेच्छूद्रा न तु दृष्टान्ततः स्मृता।॥