Advice of Prophet Yahya (John) to the Believers | About Islam

Advice of Prophet Yahya (John) to the Believers | About Islam: This a beautiful talk from Imam Omar Suleiman about the advice from Prophet Yahya (AS) on the dhikr of Allah (SWT). In this regard, he quoted Prophet Muhammad (PBUH/), giving a parable about the virtues of dhikr, as far the believers are concerned. What's that parable?