Take double the silver with you so that you may return the silver that was put back into the mouths of your sacks. Perhaps it was a mistake.
KJV
And take double money in your hand; and the money that was brought again in the mouth of your sacks, carry [it] again in your hand; peradventure it [was] an oversight:
ASV
and take double money in your hand; and the money that was returned in the mouth of your sacks carry again in your hand; peradventure it was an oversight: