What happens next?

How to grow bean sprouts indoors
Sterilize your jar.
Mason jars are ideal for sprouting, but you can use any wide-mouthed glass or plastic jar. Wash the jar well in hot, soapy water to remove dirt, dust, and any pathogens or particles that might be hiding in the container.
Dry the jar with a clean towel and set it aside. Growing sprouts can also lead to the growth of unwanted bacteria and fungi, which is why it's important to use sterilized equipment.