That the Messenger of Allah (ﷺ) said, "Whoever prepares a fighter in Allah's cause, he has participated in a military expedition, and whoever looks after the family of a fighter, he has participated in a military expedition."

This Hadith is Hasan Sahih, and it has been reported through more than one route.
Jami` at-Tirmidhi Book 22, Hadith 10
← Previous Hadith That the Messenger of Allah (ﷺ) said: "The most virtuous of charitable spending is the shade of a tent in the cause of Allah, or giving a servant in the cause of Allah, or a riding camel in the cause of Allah."

This Hadith is Hasan Gharib Sahih, and it is more correct to me than the narration of Mu'awiyah bin Salih.

Jami` at-Tirmidhi Book 22, Hadith 9 Next Hadith → That the Messenger of Allah (ﷺ) said, "Whoever prepares a fighter in Allah's cause, or looks after the family of a fighter, then he has participated in a military expedition."

This Hadith is Hasan Sahih.

Jami` at-Tirmidhi Book 22, Hadith 11