Perform ablution after taking a ritual bath as a precautionary measure against impurity or uncleanness .

This hadith teaches us the importance of cleanliness and purity in Islam. It was narrated by Yahya from Malik from Ibn Shihab that Salim ibn Abdullah said he saw his father, Abdullah ibn Umar do ghusl and then do wudu. When Salim asked why he did this even though ghusl was enough for him, his father replied that sometimes he touches his penis so he does wudu as a precautionary measure to remain pure and clean. This hadith shows us the importance of maintaining cleanliness in our lives according to Islamic teachings. It also teaches us the importance of following the Sunnah of Prophet Muhammad ﷺ who himself used to perform ablution after taking a ritual bath as a precautionary measure against impurity or uncleanness.