The Prophet ﷺ said: “My nation will come forth on the day of judgment like ‘Ghurrah Muhajjaleen’ (horses with white forelocks and white feet)[ Al-Ghurru: is the white patch on the forehead of the horse. Muhajjaleen: are horses with white feet. At-Tahjeel: White patches on their limbs. This refers to the light on the Day of Judgment that will be on the parts of the body that used to be washed during al-wudu’.] as a result of making Al-wudu’. So any of you (who is) capable of lengthening his ghurrah (places of light) should do so.” [ agreed upon.]
source: https://www.al-feqh.com/en/wudu-ablution
1. Delaying a ghusl until the time of a prayer is about to leave.
2. For a female not to pray an obligatory prayer after her menstrual cycle stops.
For example, her cylcle stopped before the period of zhur was over and the time ramaining for that prayer was enough to pray one raka’a of prayer. In this case it is obligatory on her to take a bath and pray zhur. The Prophet ﷺ said: “He who performs a raka’a of Subh prayer before the sun rises, has met (the time for) Salatul Subh. And he who performs a raka’a of Asr prayer before sunset, has met (the time for) Salatul ‘Asr.” [ agreed upon],
source: https://www.al-feqh.com/en/al-ghusl