Toxic Smite

The first time you hit a creature with a melee weapon attack during this spell’s duration, your weapon is infused with poison, and the target must succeed on a Constitution saving throw or take 2d6 poison damage and be poisoned.  The spell then ends. 

A creature poisoned by this spell makes another Constitution saving throw at the end of each of its turns. On a successful save, it is no longer poisoned. 

At Higher Levels.  When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.