Verses with the word sweetly in the Old Testament (2 verses):

Job 24:20
The womb shall forget him; the worm shall feed sweetly on him; he shall be no more remembered; and wickedness shall be broken as a tree.

Canticles 7:9
And the roof of thy mouth like the best wine for my beloved, that goeth down sweetly, causing the lips of those that are asleep to speak.