Humayd bin Zanjuyah narrated that `Abdullah, may Allah be pleased with him, said,
“The parable of the Qur’an is that of a man who sets out to find a place for his family to stay, and he comes to a place where there is evidence of rainfall. While he is walking about, admiring it, he suddenly comes upon beautiful gardens. He says, `I liked the first traces of rainfall, but this is far better.’ It was said to him, `The first place is like the Qur’an, and these beautiful gardens are like the splendor of family of Ha Mim in relation to the rest of the Qur’an’.”
This was recorded by Al-Baghawi.
Source: Tafseer ibn Katheer