This chengyu is from Xi Jinping’s New Years Day address (video and full text)
Meaning: Tenacious, unshakable, describes perseverance and firm convictio
Original: “面对突如其来的新冠肺炎疫情,我们以人民至上、生命至上诠释了人间大爱,用众志成城、坚忍不拔书写了抗疫史诗。”
Source: http://cpc.people.com.cn/n1/2021/0101/c64094-31986373.html
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