Albert Barnes Commentary Ecclesiastes 11:2

"Give a portion to seven, yea, even unto eight; for thou knowest not what evil shall be upon the earth." — Ecclesiastes 11:2 (ASV)

The verse means: “Let your hospitality and your alms be extensive: for you do not know what reverses may befall either that person who by your generosity will be strengthened to meet them, or yourself, who may come to need grateful friends.” Compare Luke 16:9.

Seven, and also to eight - A definite number for an indefinite (compare marginal reference).