Prasāda and food

Wash after eating, before worship

If you have eaten, wash your hands and feet before you go back to the Deity.

Food leaves its mark on the hands. Before you go back to worship after a meal, wash your hands and feet. The Nectar of Devotion lists entering to worship without washing the hands and feet after eating among the offenses to avoid.

Whose teaching
Vedic scripture
Where it is taught
The Nectar of Devotion, ch. 8: offense 4
Source
Vedabase
Wash after eating, before worship · HariHariBol