Translation:

18. At length when they came to a (lowly) valley of ants one of the ants said: "O ye ants get into your habitations lest Solomon and his hosts crush you (under foot) without knowing it."

Notes (Tafseer)

3258. This verse and the next, read together, suggest the symbolical meaning as predominant. The ant, to outward appearance, is a very small and humble creature. In the great pomp and circumstances of the world, she (generic feminine in Arabic) may be neglected or even trampled on by a people who mean her no harm. Yet, by her wisdom, she carries on her own life within her own sphere ("habitations") unmolested, and makes a useful contribution to the economy of the world. So there is room for the humblest people in the spiritual world.