Following the examples of Muhammad and the past prophets
Nahj al-Balāgha|Volume 1|Book 1|Chapter 160
[داوود (عليه السلام) :] وَإِنْ شِئْتَ ثَلَّثْتُ بِدَاوودَ صَاحِبِ الْمَزَامِيرِ، وقَارِىءِ أَهْلِ الْجَنَّةِ، فَلَقَدْ كَانَ يَعْمَلُ سَفَائِفَ الْخُوصِ بِيَدِهِ، وَيَقُولُ لِجُلَسَائِهِ: أَيُّكُمْ يَكْفِينِي بَيْعَهَا! وَيَأْكُلُ قُرْصَ الشَّعِيرِ مِنْ ثَمَنِهَا.
[The example of Dāwūd (David) :] If you desire I can give you a third example of Dāwūd عليه السلام. He is the holder of the Psalms and the reciter among the people of Paradise. He used to prepare baskets of date palm leaves with his own hands and would say to his companions : “Which of you will help me by purchasing it?” He used to eat barley bread (bought) out of its price.