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  Q is the name used by scholars to describe a lost source on Jesus' teachings.It can be reconstructed from the gospels of Matthew and Luke, which are based on two earlier sources: the gospel of Mark and Q. Stated differently, Q is by definition the material that Luke and Matthew have in common but is not dependent on Mark. (The letter may stand for German Quelle, "source", or may have been chosen because it follows P, the old sign to identify the gospel of Mark, who is sometimes believed to have been a disciple of Peter.) 

Q contained many sayings attributed to Jesus (such as the Lord's prayer) and two short stories (Jesus' temptation in the desert; the faith of the centurion). Its form may have been similar to the Gospel of Thomas, which contains 114 simple sayings. The genre may be related to the Epistle of Enoch.

It is not entirely clear whether Q's sayings are really Jesus'. As a rule of the thumb, we may assume that an early date of composition indicates a high reliability and vice versa. An indication that this document was composed comparatively late, is the fact that it seems to mention a murder in the Temple (Luke 11.51 = Matthew 23.36). This may be the murder described by the Jewish historian Flavius Josephus (Jewish War 4.335-343), suggesting that the final composition of Q must be dated after this incident, which took place in the winter of 67/68.

On the other hand, there are many sayings referring to the coming of the Son of Man and the establishment of the kingdom of God, which often imply that Jesus' disciples will still be alive (e.g., Luke 12.54-55 and 16.16 = Matthew 16.2-3 and 11.12). This points to an earlier date. Another indication can be found in the 'woe to' sayings. These are addressed to Galilean cities and Pharisees, suggesting that the author of Q was especially interested in the dialogue -or an exchange of invectives- with the Jews (cf. Luke 12.11-12). If Q were composed after 67/68, one would have expected a 'woe to Jerusalem' saying in this sequence.

Another argument for an early date is the story of the Roman centurion. This can easier be placed in the period of friendly relations between the Jews and the Romans before 41 than afterwards. Finally, at least one saying seems to antedate Jesus' crucifixion (Luke 14.26-27 = Matthew 10.37-38): the expression that people have to 'carry their cross' can not have been invented by early Christians.

Summing up: there is only circumstantial evidence to date Q, but the case for an early date is more convincing than the case for a late date. This suggests that the sayings go back to Jesus - but it is nothing more than a suggestion. It is impossible to establish a 'community' in which Q was the authoritative text, and no two scholars agree on this subject.

The two evangelists have used the subject matter of Q differently. Luke seems to render the sayings more or less in the same order as he found them; Matthew has used them to compose speeches (e.g. the Sermon on the Mount). It is believed that Matthew's version  stays closer to the words of the original document. The table gives an overview; the wording is Matthew's and are derived from the New King James translation.

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