Albert Barnes on Luke 14:18

I have bought a piece of ground. Perhaps he had purchased it on condition that he found it as good as it had been represented to him.

I must needs go. I have necessity, or am obliged to go and see it; possibly pleading a contract or an agreement that he would go soon and examine it. However, we may learn from this that sinners sometimes plead that they are under a necessity to neglect the affairs of religion. The affairs of the world, they pretend, are so pressing that they cannot find time to attend to their souls. They have no time to pray, or read the Scriptures, or keep up the worship of God. In this way many lose their souls. God cannot regard such an excuse for neglecting religion with approbation. He commands us to seek first the kingdom of God and his righteousness, nor can he approve any excuse that men may make for not doing it.

(m) "first" Lk 8:14