Greed and covetousness are sin (Ex. 20:18; I Tim. 6:9; Heb 13:5), and these are motives in SOME THAT GAMBLE.

Proverbs warns of disaster for people who want to get rich quickly (28:20,22).

Wealth that comes easily goes just as easily (Prov. 13:11).

Wealth gained the wrong way breaks up families (Prov. 15:27).

Gambling can be addictive, and even if you don't fall prey to it as a compulsive habit, your example may cause others to be enslaved by it (I Cor. 8:9, 13).

I therefore would not say a person who does lottery is sinning but would consider it a irresponsible way to use our money.