Answered by: Mufti Mohammed Kamran Abid
What is the ruling on a person who knew about the ruling of impurity but didn’t care?
In the name of Allah, the Most Gracious, the Most Merciful
It was narrated that Ibn ‘Abbas said, “The Messenger of Allah (saw) passed by two new graves, and he said: ‘They are being punished, but they are not being punished for anything major. One of them was heedless about preventing urine from getting on his clothes, and the other used to walk about spreading malicious gossip.'”
If a person does not care about purity, then they would have to repeat the prayers they prayed in that state because purity is a condition of prayer. The Prophet (saw) has said, “Purity is half of iman (faith).“. Purifying themselves, abstaining from impurities, seeking forgiveness from Allah, and making Tauba would be sufficient for the sin to come off of his/her account.
Only Allah knows best
Written by Mufti Mohammed Kamran Abid
Checked and approved by Mufti Mohammed Tosir Miah
Darul Ifta Birmingham
 Sunan Ibn Majah, Hadith# 347
 وعن أبي مالك الأشعري رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم: “الطهور شطر الإيمان، والحمد لله تملأ الميزان، وسبحان الله، والحمد لله تملآن -أو تملأ- ما بين السماوات والأرض” ((رواه مسلم)).
(Riyad as-Salihin, Hadith# 1413)