It is reported that ʿAbdullāh b. ʿAmr b. Al-ʿĀs – Allāh be pleased with them – said:

Leave alone what you have nothing to do with, and do not speak about what does not concern you, and secure your tongue like you secure your money.

Ibn Ḥibbān Al-Bustī, Rawḍatu Al-ʿUqalāʾ 1:55.