Sushruta Samhita
मूढगर्भोदरार्शोऽश्मरीभगन्दरमुखरोगेष्वभुक्तवतः कर्म कुर्वीत ॥१६॥
In cases of impacted fetus (mūḍhagarbha), abdominal disorders (udara), hemorrhoids (arśaḥ), stones (aśmarī), fistula-in-ano (bhagandara), and other such diseases, surgical procedures (karma) should be performed on a patient who has fasted (abhuktavataḥ).
english translation
mUDhagarbhodarArzo'zmarIbhagandaramukharogeSvabhuktavataH karma kurvIta ॥16॥
hk transliteration by Sanscript