قَالَ مَالِكٌ إِنَّهُ بَلَغَهُ أَنَّ سَعِيدَ بْنَ الْمُسَيَّبِ سُئِلَ عَنِ الشُّفْعَةِ هَلْ فِيهَا مِنْ سُنَّةٍ فَقَالَ نَعَمْ الشُّفْعَةُ فِي الدُّورِ وَالأَرَضِينَ وَلاَ تَكُونُ إِلاَّ بَيْنَ الشُّرَكَاءِ ‏.‏

Malik said that he heard that Said ibn al-Musayyab, when askedabout pre-emption and whether there was a sunna in it, said, "Yes.Pre-emption is in houses and land, and it is only between partners." Translation Not Available

Book Ref: Muwatta Imam Malik Book 35 Hadith 1399
Web Ref:  Muwatta Imam Malik Book 35 Hadith 2