Hazrat Sa’d bin Abi Waqqaas (radhiyallahu ‘anhu) says:

Three nights before embracing Islam, I had a dream in which I saw that I was engulfed in extreme darkness. On account of the darkness, I was unable to see anything. Suddenly, a moon appeared and I began to follow it. I then saw that Hazrat Zaid bin Haarithah (radhiyallahu ‘anhu), Hazrat ‘Ali (radhiyallahu ‘anhu) and Hazrat Abu Bakr (radhiyallahu ‘anhu) had preceded me in reaching this light.