The interpretation timeline

Sir 23:9

How this passage has been read — the sources, oldest to newest.

From the early Church Fathers to now.

1 Patristic · 1 Medieval

Sir 23:9 · Douay-Rheims
“Let not thy mouth be accustomed to swearing: for in it there are many falls.”
Patristic before A.D. 750
600
A.D.
Leander of Seville Patristic
c. A.D. 534–600
“Seek with the same scrupulousness to never offer oaths but to always speak the truth. As oaths are permitted to worldly people out of fear of deception, so for one leading a religious life oaths are prohibited, even when he has a clear conscience. The Lord says, "Let your speech be yes, yes, and no, no. Anything more comes from the evil one." Do not swear even when you speak the truth, because that comes from evil. It is said that it comes from evil because the need to swear comes from a bad conscience: one constrains a person to swear when he doubts his sincerity. You who should have the simplicity of the heart on your lips, why would you spontaneously bind yourself with an oath? Do not make a habit of either swearing in the good or perjuring in the bad. Speak the truth with all your heart, and there will be no need for oaths, as we read: "Do not accustom yourself to oaths, because by swearing many have fallen."”
Source
674 years pass — nothing from this stretch is hosted yet
Scholastic c. 1100 – 1500
1274
A.D.
Bonaventure Medieval
c. A.D. 1221–1274
“A promissory oath is made for entering into mutual peace: and in this is understood the restraint of all mortal sins; because "every true oath is dangerous, a false one is pernicious, and no oath is safe." And for this reason it is said in Ecclesiasticus: "Let not your mouth become accustomed to swearing."”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.