Committing sins while fasting can ruin your fast.

 You see some people listening to music while fasting, other fixing attachment hair to their hair, some dancing, lying, wearing tight fitted cloth etc


The Prophet (peace and blessings


 of Allaah be upon him) said: “When
 any of you is fasting, let him not
 commit sin…”


(Reported by al-
 Bukhaari, al-Fath, no. 1904).

The
 Prophet (peace and blessings of
 Allaah be upon him) said:
 “Whoever does not stop speaking
 falsehood and acting in accordance
 with it, Allaah has no need of him
 giving up his food and drink.”


(Al-
 Bukhaari, al-Fath, no. 1903).

The
 person who is fasting should avoid
 all kinds of haraam actions, such
 as backbiting, obscenity and lies,
 otherwise his reward may all be
 lost. The Prophet (peace and
 blessings of Allaah be upon him)
 said: “It may be that a fasting
 person gets nothing from his fast
 except hunger.”


(Reported by Ibn
 Maajah, 1/539;

May Allah! have mercy on you.Amen