The construction of (the prophet's pbuh) mosque

وَقَالَ أَبُو سَعِيدٍ كَانَ سَقْفُ الْمَسْجِدِ مِنْ جَرِيدِ النَّخْلِ. وَأَمَرَ عُمَرُ بِبِنَاءِ الْمَسْجِدِ وَقَالَ أَكِنَّ النَّاسَ مِنَ الْمَطَرِ، وَإِيَّاكَ أَنْ تُحَمِّرَ أَوْ تُصَفِّرَ، فَتَفْتِنَ النَّاسَ. وَقَالَ أَنَسٌ يَتَبَاهَوْنَ بِهَا، ثُمَّ لاَ يَعْمُرُونَهَا إِلاَّ قَلِيلاً. وَقَالَ ابْنُ عَبَّاسٍ لَتُزَخْرِفُنَّهَا كَمَا زَخْرَفَتِ الْيَهُودُ وَالنَّصَارَى.Abu Sa'id said, "The roof of the mosque was made of the leaves of date-palms." 'Umar ordered the Prophet's ﷺ mosque to be expanded (built) and said, "Protect the people from rain. Beware of red and yellow decorations, for they put the people to trial." Anas reciting a part of a Hadith said, "They will boast of them (mosques) rather than coming frequently to them for offering prayers." Ibn 'Abbas said, "You (Muslims) will surely decorate your mosques as the Jews and Christians decorated (their churches and temples)."