diff --git a/scripts/fetch_corpus.sh b/scripts/fetch_corpus.sh
new file mode 100755
index 0000000..0af0284
--- /dev/null
+++ b/scripts/fetch_corpus.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+set -euo pipefail
+mkdir -p corpus/raw
+git clone --depth 1 https://github.com/suttacentral/bilara-data corpus/raw/bilara-data
diff --git a/src/buddhagpt/corpus.py b/src/buddhagpt/corpus.py
new file mode 100644
index 0000000..4c6e878
--- /dev/null
+++ b/src/buddhagpt/corpus.py
@@ -0,0 +1,31 @@
+import json, re
+from pathlib import Path
+from typing import Iterator
+
+def _seg_sort_key(k: str):
+    # "mn21:1.2" -> numeric-aware ordering of the segment path
+    # Handle mixed types (integers and strings) by wrapping in tuples
+    parts = []
+    for p in re.split(r"[:.]", k):
+        if p.isdigit():
+            parts.append((0, int(p)))  # 0 for int, sorts before strings
+        else:
+            parts.append((1, p))  # 1 for string
+    return parts
+
+def segments_to_text(segments: dict[str, str]) -> str:
+    ordered = [segments[k] for k in sorted(segments, key=_seg_sort_key)]
+    return " ".join(s.strip() for s in ordered if s.strip())
+
+def load_bilara_suttas(root: Path) -> Iterator[dict]:
+    base = root / "translation/en/sujato/sutta"
+    for f in sorted(base.rglob("*_translation-en-sujato.json")):
+        segments = json.loads(f.read_text())
+        uid = f.name.split("_")[0]
+        title = next(iter(segments.values()), uid)
+        yield {
+            "uid": uid,
+            "title": title.strip(),
+            "text": segments_to_text(segments),
+            "collection": f.parent.name,
+        }
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_corpus.py b/tests/test_corpus.py
new file mode 100644
index 0000000..c15f5c7
--- /dev/null
+++ b/tests/test_corpus.py
@@ -0,0 +1,17 @@
+import json
+from pathlib import Path
+from buddhagpt.corpus import segments_to_text, load_bilara_suttas
+
+def test_segments_to_text_joins_in_key_order():
+    segs = {"mn21:1.2": "second.", "mn21:1.1": "First."}
+    assert segments_to_text(segs) == "First. second."
+
+def test_load_bilara_suttas(tmp_path):
+    d = tmp_path / "translation/en/sujato/sutta/mn"
+    d.mkdir(parents=True)
+    (d / "mn21_translation-en-sujato.json").write_text(
+        json.dumps({"mn21:0.1": "Middle Discourses 21", "mn21:1.1": "So I have heard."})
+    )
+    suttas = list(load_bilara_suttas(tmp_path))
+    assert suttas[0]["uid"] == "mn21"
+    assert "So I have heard." in suttas[0]["text"]