Muslims have traditionally expressed love and veneration for Muhammad. Stories of Muhammad's life, his intercession and of his miracles (particularly Splitting of the moon) have permeated popular Muslim thought and poetry. Among Arabic odes to Muhammad, Qasidat al-Burda (Poem of the Mantle) by the Egyptian Sufi al-Busiri (1211-1294) is particularly well-known, and widely held to possess a healing, spiritual power. The Quran refers to Muhammad as a mercy (rahmat) to the worlds (Quran 21:107). The association of rain with mercy in Oriental countries has led to imagining Muhammad as a rain cloud dispensing blessings and stretching over lands, reviving the dead hearts, just as rain revives the seemingly dead earth (see, for example, the Sindhi poem of Shah ʿAbd al-Latif). Muhammad's birthday is celebrated as a major feast throughout the Islamic world, excluding Wahhabi-dominated Saudi Arabia where these public celebrations are discouraged. When Muslims say or write the name of Muhammad, they usually follow it with the Arabic phrase ṣallā llahu ʿalayhi wa-sallam (may God honor him and grant him peace) or the English phrase peace be upon him. In casual writing, the abbreviations SAW (for the Arabic phrase) or PBUH (for the English phrase) are sometimes used; in printed matter, a small calligraphic rendition is commonly used ().