In addition to altarpieces, Paroli also produced numerous canvases for noble families from Gorizia, such as the Lanthieri and the Attems. As the Old Testament theme and the format testify, the painting could have been a private commission from a noble family of Gorizia.
The story of Hagar, the maidservant of Abraham's wife Sarah, is from the Book of Genesis (Gen 21:8–21). Because Sarah was barren, Hagar bore Abraham a son, Ishmael. When Sarah later became pregnant by Abraham and gave birth to a son, Isaac, Hagar and Ishmael were chased away, and she and her son wandered in the wilderness of Beersheba. They ran out of water, and just when she thought she and the child would die of thirst, an angel appeared to them and showed them a well.
Paroli placed the key figures in a wild rocky landscape and balanced the composition with a dry and cleft tree trunk. The drama of the event is illustrated by the emotional expressions on the faces of the painted figures – the exhaustion of Ishmael, the despair of Hagar, and the peaceful ease of the angel who brings salvation to both.