What is the ruling of Sharia on a husband's refusal to pay zakat under the pretext of unemployment, and what should the spouses do now, knowing that the remaining money is only enough for Hajj and expenses, and will their excuse be accepted?

Zakat (definition) is a right pertaining to wealth once it reaches the nisab (definition) (minimum threshold) and a full year (hawl) has passed over it. It becomes obligatory upon its owner, whether employed or unemployed, young or old. Therefore, the husband must pay the Zakat for all past years, and paying Zakat takes precedence over performing Hajj.