“Take care that you do not despise one of these little ones; for, I tell you, in heaven their angels continually see the face of my Father in heaven. What do you think? If a shepherd has a hundred sheep, and one of them has gone astray, does he not leave the ninety-nine on the mountains and go in search of the one that went astray? And if he finds it, truly I tell you, he rejoices over it more than over the ninety-nine that never went astray. So it is not the will of your Father in heaven that one of these little ones should be lost. (Matthew 18:10-14, NRSV)
The shepherd will come after you if you leave the flock and wander off.
He leaves the rest of the flock, on the side of the mountain, in the wilderness, to go searching for the 1 that was lost. Not because He cares more for the 1 than the 99, but He cares for all the sheep and all need to be with the flock.
So He goes searching and will risk His life to keep the sheep safe.
For one of the least of these, the savior will go to great lengths.