Masturbation with your own hand invalidates the Fast

THINGS WHICH INVALIDATE THE FAST

i1.18 Each of the following things invalidates the day's fast when one knows they are unlawful (A: during an obligatory fast) and remembers one is fasting (A: but does them deliberately anyway); and they obligate one to both make up the fast-day later and fast the remainder of that day:

(1) eating;

(2) drinking (N: and smoking (A: though not if there is some smoke in the air that one unintentionally inhales));

(3) taking snuff (O: up the nose that reaches the sinuses, a ruling likewise applicable to oil or water preparation);

(4) suppositories(O: vaginal or anal);

(5) pouring (O: water, oil, or other) into the ears until it reaches the eardrum;

(6) inserting a finger or something else into the anus or vagina further than the area disclosed when one squats(O: to relieve oneself);

(7) anything that enters the body cavity, whether stabbed into it (O: such as a knife or spear thrust which penetrates it) or whether medicine (N: though intramuscular or intravenous injections of medicine do not break one's fast);

(8) vomiting (N: if it is deliberate and one is able to prevent it, though if nausea overcomes one, vomiting does not break one's fast.

(9) sexual intercourse (O: if deliberate, even if there is no orgasm), or orgasm from stroking a non-genital region or from masturbation (O: no matter whether such orgasm is produced by unlawful means, like one's own hand (dis:w37), or whether by lawful means, such as the hand of one's wife);

(10) using so much water to rinse out the nose and mouth that some reaches the stomach (O: i.e. If any reaches the body cavity because of using an abundance of water, it breaks the fast, though if some water slips down when an abundance has not been used, it does not break it. Nor does it harm to swallow one's saliva after rinsing the mouth out, even if able to expectorate it);

(11) swallowing saliva that has left the mouth, such as when threading a needle and one moistens the end of the thread, and then moistens it, swallowing some of the saliva that the thread had been previously wetted with;

(12) swallowing saliva that has been qualitatively altered, such as when threading a needle and one wets the end, and some dye from the thread remains in the mouth and is swallowed (A: so people who use toothpaste should take care to eliminate it from the mouth before dawn on fasting days);

(13) swallowing saliva that has been made impure by contact with filth (najasa), such as when one's mouth is bloodied and one spits out the saliva until it is clear and colorless, but neglects to wash one's mouth out (O: before swallowing the saliva, which breaks the fast because the mouth is still affected by impurity (n: and water is necessary to purify it, as at e14.10));

(14) allowing phlegm or mucus at the back of the mouth to be swallowed when one could have spit them out (n: though in the Hanafi school this does not break the fast, even if intentional (al-Hadiyya al-`Ala'yya (y4), 180));

(15) or to continue making love, even for a moment, after dawn has arrived.