The oldest sources say Matthew was originally written in Hebrew. Why do some ignore what else the sources say?

The sources also say Mark and Luke had already been written, and that Matthew wrote in Hebrew while Paul was in Rome. Here are the details in chronological order. Please note the following information on what Eusebius says, in context: 1. The oldest source in Eusebius states that Matthew wrote his gospel for... show more The sources also say Mark and Luke had already been written, and that Matthew wrote in Hebrew while Paul was in Rome. Here are the details in chronological order.

Please note the following information on what Eusebius says, in context:

1. The oldest source in Eusebius states that Matthew wrote his gospel for "the Hebrews" in his "native language" (literally "father tongue")

But he then goes on to say that the Gospels of Mark and Luke had already been published by that time. --Eusebius III. xxiv. 5-7

2. The second oldest source (quoting Papias) states that Matthew collected his writings in the Hebrew language (literally Hebrew dialect). --Eusebius III, xxxix. 16

3. The third oldest source (citing Irenaeus) says Matthew published his Gospel for the Hebrews in their "native language." He then says that Matthew's did so "while Peter and Paul were establishing the church in Rome." --Eusebius V. vvi. 1-3

4. Eusebius also states that Paul originally wrote Hebrews in Hebrew, and that it was translated into Greek by either Luke or Clement or Rome.
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