«مَعَ رُفْقَةٍ غُذُوا بِلِبَانِ الْبَيَانِ»
I was with companions who seemed to have been nourished on the milk of eloquence.
Rufqa means a group of companions. Libān, milk, becomes an image for nourishment: just as milk builds the body, eloquence is portrayed as feeding the mind and tongue.
This signals an accomplished literary circle, not merely a casual conversation among travellers.