Jami` at-Tirmidhi 1631
جامع الترمذي#1631SahihNarrated Zaid bin Khalid Al-Juhani: That the Messenger of Allah (ﷺ) said, "Whoever prepares a fighter in Allah's cause, he has participated in a military expedition, and whoever watches after the family of a fighter, he has participated in a military expedition." [Abu 'Eisa said:] This Hadith is Hasan Sahih
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 22:13