Valmiki Ramayana Ayodhya Kanda Sarga 61 Shloka 13
Original Shlokaतत्र ये गुणवन्तश्च विद्वांसश्च द्विजातयः। न पश्चात्तेऽभिमन्यन्ते सुधामपि सुरोपमाः।।2.61.13।।
1 source checked for this shloka
तत्र there, ये those, गुणवन्तश्च virtuous, विद्वांसश्च learned, सुरोपमाः similar to devatas, द्विजातयः ते those brahmins, पश्चात् after others, सुधामपि even ambrosia, न अभिमन्यन्ते will not accept.
The godlike brahmins who are virtuous and learned will not accept the food after others have partaken even if it is ambrosia.