"And the LORD came, and stood, and called as at other times, Samuel, Samuel. Then Samuel answered, Speak; for thy servant heareth." (1 Samuel 3:10)
There are a number of other times in Scripture when the Lord repeated a second time the name He was calling, always at a time of great significance and urgency. Once had been to Moses: "God called unto him out of the midst of the bush, and said, Moses, Moses. And he said, Here I am" (Exodus 3:4).
God then ordained Moses to lead His people out of Egypt. When He called Samuel, it was to lead His people out of the chaos of the period of the judges and to prepare them for the Davidic Kingdom. The first time God had called in this fashion was to Abraham, and then it was to confirm that he had passed God’s final test for the fulfillment of the great promise concerning the blessing on his seed. "And the angel of the LORD called unto him out of heaven, and said, Abraham, Abraham: and he said, Here am I" (Genesis 22:11).
In the New Testament, the Lord Jesus spoke thus unto all His rebelling nation: "O Jerusalem, Jerusalem, . . . Behold, your house is left unto you desolate" (Matthew 23:37-38). Before this, He had spoken both in grief and in encouragement to Peter, who must be prepared to lead the disciples later on. ". . . Satan hath desired to have you, that he may sift you as wheat: But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren" (Luke 22:31-32). Finally, when the Lord was ready to call Paul as His apostle to the Gentiles, He met him on the road to Damascus: "Saul, Saul, why persecutest thou me?" (Acts 9:4).
The last calling in the Bible is not a two-fold call, but four-fold! "And the Spirit and the bride say, Come. And let him that heareth say, Come. And let him that is athirst come. And whosoever will, let him take the water of life freely" (Revelation 22:17). HMM