Abu Imran relates: I asked Sayyiduna Jundub bin Abdullah (may Allah be pleased with him): "Did you use to take forced labour from the non-Arabs?" He said: "We would press them into service from one village to the next; they would show us the way, and then we would let them go."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1663