"So excited for @jillmdillard & @derickdillard! They've been praying about and working towards this transition since late last year, and are so excited to finally be heading to the mission field!" Jill's sister Jessa Duggar -- who's pregnant with her first baby with husband Ben Seewald -- wrote on Instagram. "Please continue to pray for them!"
"We have a deep love and care for all of the world and a real passion for those in the nations, as many have even seen in the early stages of our relationship," he wrote. "We don't expect this new adventure to always be easy. But God never promised that following Him wouldn't have its challenges."