Muhammad Prophet (PBUH) was a blessing to all mankind, as his life is a great epitome of kindness to all the Muslim on the other hand he instructed about the great destructive sins which could lead anyone to Hell!
Abu Hurairah (may Allah be pleased with him) narrated that Muhammad Peace Be Upon Him said: “Avoid these seven great destructive sins.
1. Worshiping other than Allah
The basis of Islamic Teaching starts with the “Allah is one and Muhammad Prophet SAWW is his last messenger”. And when one worships other than Allah, in terms of putting believe in anyone accept Allah, is a great sin!
2. To Practice Magic
Magic and astrology is strictly prohibited in Islam, because the authority of the knowledge and anyone’s future is in Allah’s hand.
3. To kill a Life!
“Killing” is strictly against the Islamic teachings. Killing any life, Human or Animal is considered as a great sin in Islam.
4. Eating INTEREST
In Islam, it is to believe that Interest makes Rich the Richest and Poor the Poorest! And it is clearly spreads injustice in the society. Islam, denies having such rule, so the Interest is strictly haraam (Prohibited) in Islam.
5. Eating up Orphan’s Wealth
“Looking after Orphans” is a Sunnah as well as not just Muhammad PBUH but also, Abu Bakr (RA), Uthman (RA), Ali (RA), Hassan (RA) and Hussain (RA) commended to look after the Orphans and prohibited the Ummah to eat up their waealth and injustice with them.
6. Leaving Battlefield During The Fight
Feeling from the battlefield is considered to be the disloyalty because, a Muslim can never be disloyal to anyone, Battlefield is the time when you have to show the love for the people you love (If the war is in the way of Allah)
7. Falsely Accusing Chaste Woman!
Accusing a woman of a wrong doing which she never committed can cause you a great trouble, as you are not just hurting her but you are also destroying her whole life by questioning her character.
Source: [Sahih Al-Bukhari, Book of Wills and Testaments (Wasaayaa), Hadith: 2766]