It's painful for any parent to lose a child. "19 Kids and Counting" stars Jim Bob and Michelle Duggar know that feeling very well since they've lost their stillborn daughter, Jubilee, over six years ago.

So on December 11 - the day Jubilee would have celebrated their sixth birthday - the Christian couple paid tribute to her in a touching Facebook post. "It's hard to believe Jubilee would have been 6 years old today," the post read. "Jubilee is our 20th child who was stillborn. We so look forward to seeing Jubilee in heaven. In the Bible, King David's baby died and he stated, 'I shall go to him, but he shall not return to me.' This is our hope of eternal life, if each one of us repents of our sins and put our faith and trust in Jesus."

The painful memory was even aired in the family's TLC show several years back. A lot of fans still remember that episode, and they are thanking the Duggars now for displaying Christian strength and fortitude during that terrible ordeal.

"I remember watching that episode and thinking it was the strongest Christian witness I have ever seen," a fan commented on their post.

Jim Bob and Michelle quoted the Bible verse Job 1:21 after they lost Jubilee. The verse reads, "The Lord giveth and the Lord taken away, blessed be the name of the Lord." Another fan said the simple verse made such a huge impact in her life, and she admires the Duggar family over how they handled grief. "Your whole family is such a wonderful testament about the power of forgiveness and unconditional love of Christ. I would love to meet you one day. Blessings!" she added.

During Jubilee's memorial service back in 2011, Jim Bob and Michelle told PEOPLE that they were dealing with intense sorrow and grief, but because of God, they managed to find peace. "I really believe that God sees the bigger picture. I hope that her short life can encourage other people who have gone through things like this. It was very healing, and we have precious memories," said Jim Bob.