Brush your teeth with siwak before praying at night.

This hadith is about the importance of hygiene and cleanliness in Islam. It was narrated from Hudhaifah that when the Prophet Muhammad got up to pray at night, he would brush his teeth with a siwak, which is a small stick made from a tree root. This shows us that it is important to keep our bodies and mouths clean before we pray, as this will help us focus on our prayer and make it more meaningful. Additionally, this hadith also teaches us about taking care of ourselves and being mindful of our hygiene habits in general. We should strive to keep ourselves clean throughout the day so that we can be closer to Allah through prayer and other acts of worship.