A woman made a sign from behind a curtain to indicate that she had a letter for the Messenger of Allah ﷺ. The Prophet ﷺ closed his hand, saying: I do not know this is a man's or a woman's hand. She said: No, a woman. He said: If you were a woman, you would make a difference to your nails, meaning with henna.
أَوْمَتِ امْرَأَةٌ مِنْ وَرَاءِ سِتْرٍ بِيَدِهَا كِتَابٌ إِلَى رَسُولِ اللَّهِ ﷺ فَقَبَضَ النَّبِيُّ ﷺ يَدَهُ فَقَالَ مَا أَدْرِي أَيَدُ رَجُلٍ أَمْ يَدُ امْرَأَةٍ قَالَتْ بَلِ امْرَأَةٌ قَالَ لَوْ كُنْتِ امْرَأَةً لَغَيَّرْتِ أَظْفَارَكِ يَعْنِي بِالْحِنَّاءِ