meaning, He has better knowledge than you of how things will turn out to be in the end, and of what benefits you in this earthly life and the Hereafter If he is not needed, then he remains behind
Az-Zuhri said, "Jihad is required from every person, whether he actually joins the fighting or remains behind Fighting is ordained for you Muslims , In this Ayah, Allah made it obligatory for the Muslims to fight in Jihad against the evil of the enemy who transgress against Islam

عسى

and that you like a thing which is bad for you.

عسى ان تكرهوا شيئا وهو خيراً لكم
Fighting is prescribed for you, and ye dislike it
فعسى أن تكرهوا شيئا ويجعل الله فيه خيرا كثيرا
Hence, one might covet something, yet in reality it is not good or beneficial for him, such as refraining from joining the Jihad, for it might lead to the enemy taking over the land and the government
عسى ان تكرهوا شيئا وهو خيراً لكم
This Ayah is general in meaning
' Indeed, fighting is as the Ayah describes it, as it includes being killed, wounded, striving against the enemies and enduring the hardship of travel Whoever remains behind is required to give support, if support is warranted; to provide aid, if aid is needed; and to march forth, if he is commanded to do so
Hence, obey Him and adhere to His commands, so that you may acquire the true guidance

عسى ان تكرهوا شيئا وهو خير لكم English Translation

and it may be that you dislike a thing which is good for you, meaning, fighting is followed by victory, dominance over the enemy, taking over their lands, money and offspring.

20
عسى ان تكلرهوا شيئا وهو خيرا لكم
If you were required to march forth, then march forth
عسى ان تكلرهوا شيئا وهو خيرا لكم
, in Allah's cause , nor sincerely considered fighting, will die a death of Jahiliyyah pre-Islamic era of ignorance
2vs216
But it is possible that ye dislike a thing which is good for you, and that ye love a thing which is bad for you