Beware lest ye offend the feelings of anyone, or sadden the heart of any person, or move the tongue in reproach of and finding fault with anybody, whether he is friend or stranger, believer or enemy. Pray in behalf of all and entreat God for forgiveness and bounty for all. Beware, beware that any soul take revenge or retaliate over another even if he be a bloodthirsty enemy. Beware, beware that any one rebuke or reproach a soul, though he may be an ill-wisher and an ill-doer.

‘Abdu’l-Bahá, Tablets of ‘Abdu’l-Bahá v1, p. 44

Did men but know what pure wine of the mercy of their Lord, the Mighty, the All-Knowing, was beneath the seal, they would certainly cast aside reproach and seek to be satisfied by this Servant; but now have they veiled Me with the veil of darkness which they have woven with the hands of doubts and fancies.

‘Abdu’l-Bahá, A Traveller's Narrative, p. 81

Endure the aggressor's taunts, put up with the enemy's reproaches.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 245

Generally the speech of reproach and rebuke is rather too severe for the people and would be heartbreaking to them.

‘Abdu’l-Bahá, Some Answered Questions, p. 167

If, after reaching the result, one or other of the members does not agree with it, neither of the other members nor any one must argue with or reproach him, but keep silence; then they will write to this Servant.

‘Abdu’l-Bahá, Bahá’í World Faith, p. 406