Translation:

29. Therefore proclaim thou the praises (of thy Lord): For by the Grace of thy Lord thou art no (vulgar) soothsayer nor art thou one possessed.

Notes (Tafseer)

5063. The greatest of the Prophets was called a soothsayer, i.e., one who tells fortunes by divination, or a madman possessed of some evil spirit, or a poet singing spiteful satires. Much more may lesser men be called by such names because they proclaim the Truth. They should go on in spite of it all.