Related for Eruvin 58:8

תמרים בכמה אמר רב יוסף תמרים בקב אמר רב יוסף מנא אמינא לה דתניא אכל גרוגרות ושילם תמרים תבא עליו ברכה

the reason<span class="x" onmousemove="('comment',' Why two quarters of a to,] are prescribed.');">²⁴</span> is that less than that quantity is of no importance, but here<span class="x" onmousemove="('comment',' 'Erub.');">²²</span> [this does] not [apply, for] it is usual for people to drink one cup<span class="x" onmousemove="('comment',' Containing a quarter of a log of beer.');">²⁵</span> in the morning and another<span class="x" onmousemove="('comment',' Containing a quarter of a log of beer.');">²⁵</span> in the evening and to rely upon these [as their meals].<span class="x" onmousemove="('comment',' Such a quantity is consequently sufficient for the purposes of an 'erub.');">²⁶</span>

Tosefta Terumot