من لا يحضره الفقيه, volume 2, page 133

Hadith.1946 - Imam (as) said: "Anything that harms a person due to fasting makes breaking the fast obligatory for them."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.1947 - Al-'Ala narrated from Muhammad ibn Muslim, who said: "I heard Abu Ja'far (as) say: 'An elderly person and one suffering from chronic thirst are not at fault if they break their fast during the Month of Ramadan. Each of them should give a mudd (a specific measure) of food as charity for each day, and there is no obligation to make up the fast. If they cannot afford this, then there is nothing upon them.'"

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.1948 - Ammar ibn Musa narrated from Abu Abdullah (as) regarding a man who becomes so thirsty that he fears for his life. Imam (as) said: "He may drink just enough to sustain himself and prevent collapse, but he should not drink until he is fully satisfied."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.1949 - In the narration of Ibn Bukayr, it is reported that Imam Jafar ibn Muhammad Al-Sadiq (as) was asked about the verse of Allah (swt), the Exalted: "And upon those who can fast with difficulty, there is a ransom: the feeding of a poor person" (Surah Al-Baqarah 2:184). Imam (as) said: "[This applies] to those who were able to fast but then became elderly, suffered from chronic thirst, or similar conditions. They must give a mudd (a specific measure) of food for each day."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.