u/Humble-Blackberry627

I've had this tune in my head for such a long time now. Thing is I don't know where it is from. I always assumed that this was from the sunday school chorus 'Trust in the Lord and don't despair', but that doesn't seem to be the case. Can anyone help me?

Humming: https://voca.ro/11SaTJ9OqgQ4. Sorry, it's not in the same scale as the image.