Hadith of Golden Chain al-Bayt, hence called "Hadith of Golden Chain". Several Important hadith collections quoted it as "Al-Tawhid", "Ma'ani al-Akhbar", and Oyoun Akhbar Al-Ridha of al-Shaykh al-Saduq and Al-Amali of Shaykh Tusi. The hadith is also narrated in sunni hadith books. Regarding the implications of the hadith, there are two extreme opinions by Sunni scholars; While some of them discrediting the hadith by implying that the Sunni books lack it, some others claim that all Sunni scholars accepted it. According to shia, two important points may be derived from the Hadith. On one hand, monotheism takes the believers to "Allah's fortress", which is
Tree swallow as "Hirundo bicolor" by Louis Pierre Vieillot in his "Histoire naturelle des oiseaux de l'Amérique Septentrionale", published in 1807. The genus it is currently placed in, "Tachycineta", was established by Jean Cabanis in 1850. This swallow is sometimes placed in the genus "Iridoprocne", along with the mangrove swallow, white-rumped swallow, white-winged swallow, and Chilean swallow. The placement was first made by Elliott Coues, on the basis of its plumage. The tree swallow is also called the white-bellied swallow, for its white underparts. The generally accepted genus name is from Ancient Greek "takhykinetos", "moving quickly", and the specific "bicolor" is Latin