فَاِنَّهُمْ لَاٰكِلُوْنَ مِنْهَا فَمَالِـُٔوْنَ مِنْهَا الْبُطُوْنَۗ ( الصافات: ٦٦ )
fa-innahum
فَإِنَّهُمْ
And indeed they
laākilūna
لَءَاكِلُونَ
(will) surely eat
min'hā
مِنْهَا
from it
famāliūna
فَمَالِـُٔونَ
and fill
min'hā
مِنْهَا
with it
l-buṭūna
ٱلْبُطُونَ
(their) bellies
Fa innahum la aakiloona minhaa famaali'oona minhal butoon (aṣ-Ṣāffāt 37:66)
Sahih International:
And indeed, they will eat from it and fill with it their bellies. (As-Saffat [37] : 66)
1 Mufti Taqi Usmani
So, they have to eat from it and have to fill their bellies with it.