Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:282al-Miqdām b. Dāwud > Dhuʾayb > Sulaymān b. Sālim > ʿAbd al-Raḥman b. Ḥumayd from his father from his grandfather

[Machine] The Messenger of Allah ﷺ said, "The prayer of Hajir is from the prayer of the night." So I asked Abdullah bin Humaid about Hajir, and he said, "It is when the sun sets."  

الطبراني:٢٨٢حَدَّثَنَا الْمِقْدَامُ بْنُ دَاوُدَ ثنا ذُؤَيْبٌ ثنا سُلَيْمَانُ بْنُ سَالِمٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ حُمَيْدٍ عَنْ أَبِيهِ عَنْ جَدِّهِ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «صَلَاةُ الْهَجِيرِ مِنْ صَلَاةِ اللَّيْلِ» فَسَأَلْتُ عَبْدَ الرَّحْمَنِ بْنَ حُمَيْدٍ عَنِ الْهَجِيرِ قَالَ «إِذَا زَالَتِ الشَّمْسُ»