Reference for Eruvin 160:8

ולא אמרו לערב בחצירות אלא כדי שלא לשכח את התינוקות:

THE SOLE REASON FOR THE INJUNCTION TO PROVIDE 'ERUBS FOR COURTYARDS<span class="x" onmousemove="('comment',' After Shittuf had been arranged.');">²³</span> BEING THAT [THE LAW OF 'ERUB] SHALL NOT BE FORGOTTEN BY THE CHILDREN.<span class="x" onmousemove="('comment',' The rising generation. As this is the sole reason of its institution its regulations are in every way to be relaxed.');">²⁴</span> <big><b>GEMARA: </b></big>What are we dealing with?<span class="x" onmousemove="('comment',' In the ruling that IF THE FOOD . . WAS REDUCED . . THERE IS NO NEED TO INFORM THEM, from which it follows that if nothing of the food remained the residents must be informed if a new 'erub is prepared on their behalf.');">²⁵</span> If it be suggested: With the same kind,<span class="x" onmousemove="('comment',' Sc. that the addition to the 'erub is made from the same kind of food as that of the original.');">²⁶</span>

Jastrow