As Ecc 5:18 refers to the “laboring” man (Ecc 5:12), so Ecc 5:19 to the “rich” man, who gets wealth not by “oppression” (Ecc 5:8), but by “God’s gift.” He is distinguished also from the “rich” man (Ecc 6:2) in having received by God’s gift not only “wealth,” but also “power to eat thereof,” which that one has not.
to take his portion - limits him to the lawful use of wealth, not keeping back from God His portion while enjoying his own.