Sahih al-Bukhari - Book 78, Hadith 175
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Narrated Anas bin Malik: The Prophet (ﷺ) came to some of his wives among whom there was Um Sulaim, and said, "May Allah be merciful to you, O Anjasha! Drive the camels slowly, as they are carrying glass vessels!" Abu Qalaba said, "The Prophet (ﷺ) said a sentence (i.e. the above metaphor) which, had anyone of you said it, you would have admonished him for it".
How the Prophet ص modelled this behaviour here
Gentleness & Kind Speech
“May Allah be merciful to you, O Anjasha! Drive the camels slowly, as they are carrying glass vessels!”
Is gentle and soft toward his wife in word and deed; speaks kindly and never with harshness, insult, or contempt.