Moses at the left, with the hooded Eleazar beside him, calls to the people of Israel who are being attacked by a plague of serpents that God sent them because of their sinfulness. He tells them to look at a bronze serpent he has set up on a pole, upper left, because 'everyone that is bitten, when he looketh upon it shall live.' Old Testament (Numbers 21: 6-9). This work was probably executed with some studio assistance during the second half of the 1630s. The painting may have been blocked in by a member of the studio on the basis of a modello by Rubens, & then worked up by the master. It has been suggested that the woman at the right of centre in black may be based on the artist's second wife Hélène Fourment.