What is the significance of the 3rd, 9th and 40th day after passing?

What are funerals traditionally held the 3rd day after a soul falls asleep?  Why are there commemorations on the 9th and 40th day?  In this informative article from the Catalog of Good Deeds Orthodox website,  these questions and more are answered...

Death in Orthodox Christianity is not viewed as the end of our existence. After death, the soul is only temporarily separated from the body. During the first 40 days, it goes through certain trials and meets its Creator. During this period, a soul’s posthumous fate is decided until it will be ultimately determined at the Final Judgement preceding the Universal Resurrection. The 3rd, 9th and 40th days after death are important for the posthumous existence of the deceased. [ Rest of the article ]