According to the Quran it’s not a sin to use the left hand!
The tradition and narrations say that using the left hand is evil and an act of the devil. The Quran doesn‘t agree with this.
The terms about left and right in the Quran have no relevance to the hand (al-Balad  19; al-Haqqa  25; al-Waqia  9).
According to the Quran it is not important which hand to use, but to eat clean and allowed (halal) things (al-Baqara  168), not to waste (al-Isra  27) and not to be unfair (al-Baqara  188).
The devil doesn’t care if you use the left hand, but if you make and use ursury/interest then it is an act of the devil (al-Baqara  275).
The Quran has given people the choice whether to use the left hand or not. After complying with the necessary hygiene and cleansing, the person should decide for himself whether to eat with his hands or feet (in exceptional circumstances).