Manava Dharmashastra 6.55

6.55

bhaikṣakāryasya bhojanasyaikakālatā vidhīyate, na punarbhaikṣacaraṇasyaiva | dvirbhojanapratiṣedho'trābhisaṃhitaḥ | tatra sakṛccaritvā dvitīyasminkāle śeṣayitvā na bhuñjīta, tadartho bhojanapratiṣedhaḥ | ata evāha na prasajjeta vistara iti | dvitīyabhojanārthitayā hi vistaraḥ prāpnoti | ekārāmasya na bhṛtyārthena bhaikṣavistara iti | hetuṃ bruvan sakṛdbhojane'pi sauhityaṃ niṣedhati |

Medhātithi’s commentary (manubhāṣya):
What is laid down here is that the man shall eat once, this being the purpose of the alms; it does not mean that he shall go to beg only once. What is intended here is the prohibition of eating twice; that is, the man, having gone for alms once, shall not save out of it for eating again. It is with a view to this that we have the prohibition of eating. It is for this reason that the text adds ‘he shall not seek for a large quantity;’ Seeking for a large quantity can only be for the purpose of eating again and again; specially because for one who delights in solitude, large quantities of food would not be wanted for the sake of servants and other dependents. By supplying a reason for what is laid down, the text implies that even at a single meal the man shall not eat too much.—(55)