Treatise on Rights is the only work attributed to Imam Zayn al-Abidin (AS) other than supplications or relatively short sayings and letters. The fact that it was a written document from the first may support the suggestion that at least some of the supplications were originally written compositions.
6. حق اليد
6. The Right of the Hand
وَأَمَّا حَقُّ يَدِكَ فَأَنْ لا تَبْسُطَهَا إلَى مَا لا يَحِلُّ لَكَ.
The right of your hand is that you stretch it not toward that which is unlawful to you.