We often recite Exodus 34:6,7 in our prayers. These verses contain what are known as the 13 Middos HaRachamim, the thirteen attributes of mercy.
It's actually a dispute how to break up the two verses into thirteen attributes. I recall seeing in a sefer somewhere, I thought it was Toras Chaim (by Mossad HaRav Kook) but couldn't find it there, a large chart listing many many opinions (I think around 20). Where can I find such a chart? It doesn't have to be the one I remembered, but bonus points if you find that too.