“The Prophet (ﷺ) set out in the early morning and I did likewise. I prayed, then I sat. The Prophet (ﷺ) turned to me and said: ‘Do you have a stomach problem?’* I said: ‘Yes, O Messenger of Allah.’ He said: ‘Get up and pray, for in prayer there is healing.’”

Another chain with similar wording. Abu `Abdullah said: A man narrated it to his people, then they were stirred up against him.
Sunan Ibn Majah Book 31, Hadith 23
← Previous Hadith “I heard Abu Ubayy bin Umm Haram, who had prayed with the Messenger of Allah (ﷺ) facing both the Qiblah, saying: ‘I heard the Messenger of Allah (ﷺ) say: “You should use senna and the Sannut, for in them there is healing for every disease, except the Sam.” It was said: “O Messenger of Allah, what is the Sam?” He said: “Death.” (One of the narrators) ‘Amr said: “Ibn Abu ‘Ablah said: the ‘Sannut is dill.” Others said: “Rather, it is honey that is kept in a skin (i.e., receptacle) used for ghee.”*

Sunan Ibn Majah Book 31, Hadith 22 Next Hadith → “The Messenger of Allah (ﷺ) forbade treating illness with foul things (Khabith), meaning poison.”*

Sunan Ibn Majah Book 31, Hadith 24