What does 1 Samuel 6:8 mean?
The priests have instructed the leaders of the Philistines on how best to send the ark of the Lord (Exodus 25:10–16) back to Israel. Their plan also includes testing whether the plague ravaging their land was truly from the Lord (1 Samuel 6:1–7). First, they are to include a guilt offering (1 Samuel 6:3–4). Then they must get the ark back to the land of Israel. To do so, the priests have instructed the leaders to have a new cart built and to yoke the cart to two milk cows who have never been yoked before while their calves remain back home (1 Samuel 6:7).Now the priests instruct the leaders to place the ark of the Lord on the cart, along with a box containing the guilt offering. That offering consists of five gold tumors and five gold mice, or perhaps five gold tumors shaped as mice (1 Samuel 6:4). These gold pieces are being sent to the Lord as the Philistine version of a guilt offering in which the representation of a bad thing would be sent away in hopes of an angry god taking the actual bad thing away from them, as well.
Finally, the priests instruct the leaders to release the cows and let them go in whatever direction they will. Since the cows have never been harnessed, they won't be influenced by any human instruction. Nature would lead the un-trained animals back home to their calves. Divine influence would lead them straight to Israel. The course they take will reveal to the priests the true cause of the plague upon the Philistines (1 Samuel 6:9).