When did tongues cease? If foreign tongues were really a sign of coming judgment upon the nation Israel, then once this judgment had come, the sign-gift would no longer be necessary. Any Jew who knew his Old Testament should have recognized foreign tongues as a solemn warning of coming judgment. Once the judgment had come, the warning sign was no longer needed!
God graciously waited four decades following the crucifixion of His Son (Israels rejected Messiah) before He brought final judgment upon the nation. But in 70 A.D. the Romans under General Titus brought the Christ-rejecting nation to its final ruin. Ever since A.D. 70 there has been no question that Israel as a nation is under the judgment of God. The Jews have been forced out of the land. They have been scattered and persecuted throughout the world. It is obvious that God is no longer working through His chosen nation. His program has now shifted and Gods witnesses are among all nations. The Jews are out of the land, a definite sign that they are now under Gods curse (cf. Deuteronomy 28).
In every nation where they have been scattered they constantly hear foreign tongues (Russian, German, English, etc.) as a continual reminder to them that they have refused the blessing and rest of God. Interestingly enough, not one book in the New Testament was written in the language of the Jews. Not only did God shift from Israel to the Church, but He also shifted from Hebrew to Greek as the language through which He would give His Word! God has not cast away His people Israel (Romans 11:1), but He has cast them aside for a time. The final and ultimate event which marked Israels judgment was the destruction of Jerusalem in 70 A.D., an event that was predicted by our Lord forty years before (Matthew 23:38; 24:2).
Therefore, it must be concluded that the gift of tongues as a sign-gift was no longer needed after 70 A.D. Tongues must have ceased on or before 70 A.D. The last historical mention of the gift of tongues is in 1 Corinthians which was written about 55 A.D. There is no evidence historically that the genuine gift of tongues ever occurred after 70 A.D. Tongues served their purpose, and tongues ceased, even as God had predicted through the Apostle Paul (1 Corinthians 13:8). Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth not for them that believe not, but for them which believe (1 Corinthians 14:22).