Sheikh Ibn Uthaymeen رحمه الله said, "What is surprising is that the people are negligent of these 10 days of Dhul Hijjah. You find them in the last 10 days of Ramadan striving in deeds but as for the first10 days of Dhul Hijjah, you barely find anyone differentiating between them and other than them. However if a person performs righteous actions in these 10 days in revival of that which He ﷺ guided towards from the righteous actions, then he is upon great good." [مجمو ع فتاوى ٢١ / ٣٨-٣٧]