thy belly is like a heap of wheat;
which denotes the fruitfulness of the church in bringing souls to Christ, comparable to a pregnant woman; and whose fruit, young converts born in her, are compared to "a heap of wheat" for their number, choiceness, and solidity, being able to bear the fan of persecution: it was usual with the Jews to scatter wheat on the heads of married persons at their weddings, three times, saying, "increase and multiply" F18; see (Isaiah 66:8) (Matthew 3:12) . This heap of wheat is said to be "set about", or "hedged, with lilies" F19; which suggests, that it was not a heap of wheat on the corn floor which is meant, but a field of standing wheat, enclosed and fenced, not with thorns, but lilies; and these lilies may signify grown saints, who are often compared to lilies in this book, by whom young converts are encompassed and defended; or the beauties of holiness, in which they appear as soon as born again, (Psalms 110:3) .
John Gill