Ibn Mas'ud (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said: "The people who will be nearest to me on the Day of Resurrection will be those who supplicate Allah more often for me."[At-Tirmidhi]. (DE)
App reference (DE): Book 15, Hadith 2 (DE)
Arabic/English book reference (DE): Book 15, Hadith 1398 (DE)