Perform your ablutions thoroughly and mindfully with water or sand.

This hadith is about the practice of ablution which is a ritual cleansing that Muslims perform before prayer. It involves washing certain body parts in a specific order with water or sand. According to this hadith narrated by Ibn 'Abbas, the Prophet Muhammad (ﷺ) performed ablution by washing each body part only once. This teaches us that we should be mindful and thorough when performing our ablutions so that we can properly cleanse ourselves before prayer and other religious activities.