by C. H. Spurgeon from his Morning by Morning devotional for January 20th
2 And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground. Genesis 4:2 (KJV)
As a shepherd Abel sanctified his work to the glory of God, and offered a sacrifice of blood upon his altar, and the Lord had respect unto Abel and his offering. This early type of our Lord is exceedingly clear and distinct. Like the first streak of light which tinges the east at sunrise, it does not reveal everything, but it clearly manifests the great fact that the sun is coming. As we see Abel, a shepherd and yet a priest, offering a sacrifice of sweet smell unto God, we discern our Lord, who brings before His Father a sacrifice to which Jehovah ever hath respect. Abel was hated by his brother—hated without a cause; and even so was the Saviour: the natural and carnal man hated the accepted man in whom the Spirit of grace was found, and rested not until his blood had been shed. Abel fell, and sprinkled his altar and sacrifice with his own blood, and therein sets forth the Lord Jesus slain by the enmity of man while serving as a priest before the Lord. “The good Shepherd layeth down His life for the sheep.”1 Let us weep over Him as we view Him slain by the hatred of mankind, staining the horns of His altar with His own blood. Abel’s blood speaketh. “The Lord said unto Cain, ‘The voice of thy brother’s blood crieth unto Me from the ground.'”2 The blood of Jesus hath a mighty tongue, and the import of its prevailing cry is not vengeance but mercy. It is precious beyond all preciousness to stand at the altar of our good Shepherd! to see Him bleeding there as the slaughtered priest, and then to hear His blood speaking peace to all His flock, peace in our conscience, peace between Jew and Gentile, peace between man and his offended Maker, peace all down the ages of eternity for blood-washed men. Abel is the first shepherd in order of time, but our hearts shall ever place Jesus first in order of excellence. Thou great Keeper of the sheep, we the people of Thy pasture bless Thee with our whole hearts when we see Thee slain for us.
1John 10:11 2Genesis 4:10

They are not only His by choice, but by purchase. He has bought and paid for them to the utmost farthing, hence about His title there can be no dispute. Not with corruptible things, as with silver and gold, but with the precious blood of the Lord Jesus Christ, the Lord’s portion has been fully redeemed. There is no mortgage on His estate; no suits can be raised by opposing claimants, the price was paid in open court, and the Church is the Lord’s freehold for ever. See the blood-mark upon all the chosen, invisible to human eye, but known to Christ, for “the Lord knoweth them that are His” 1; He forgetteth none of those whom He has redeemed from among men; He counts the sheep for whom He laid down His life, and remembers well the Church for which He gave Himself.