Taking care of one's hygiene by using a siwak at least once per day or during prayers.

This hadith is about the importance of using a siwak, which is a small twig used as a toothbrush. It was narrated by Abu Huraira and Ali who said that Prophet Muhammad suggested that it would be beneficial for the ummah to use the siwak at the time of every prayer, but he realized that it would be too difficult for them. This hadith teaches us about taking care of our hygiene and how important cleanliness is in Islam. It also shows us how considerate Prophet Muhammad was towards his followers; he wanted what was best for them even if it meant not imposing something on them if they could not handle it.