Speak the truth – Al Qur’an 3:17
Speak straight – Al Qur’an 33:70
Speak justice – Al Qur’an 6:152
Speak kindly – Al Qur’an 2:83
Speak politely – Al Qur’an 17:53
Speak fairly – Al Qur’an 17:28
Speak gently – Al Qur’an 20:44
Speak graciously – Al Qur’an 17:23
Speak not in vain – Al Qur’an 23:3
Speak no lie – Al Qur’an 22:30

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— (via halawatul-iman)