L source

[1][2] The question of how to explain the similarities among the Gospels Matthew, Mark, and Luke is known as the synoptic problem.

According to the four-document hypothesis, the author combined Mark, the Q source, and L to produce his gospel.

[1] I. Howard Marshall (1994) stated: "Luke rightly regarded these sources as reliable".

[3] James R. Edwards (2009) equated the L source with the Hebrew Gospel referred to by patristic authors.

[8] Theissen (1998) went further, stating that the special material comprises nearly half of the Gospel of Luke.

Visualisation of the four-document hypothesis . "L" is the term for material unique to the Gospel of Luke.
According to Honoré (1968), the unique material ("L") amounted to 35% of the Gospel of Luke. [ 8 ]